График функции
-1.0 -0.8 -0.6 -0.4 -0.2 1.0 0.0 0.2 0.4 0.6 0.8 0.5 -0.5
Область определения функции
Точки, в которых функция точно неопределена:x 1 = 0 x_{1} = 0 x 1 = 0
Точки пересечения с осью координат X
График функции пересекает ось X при f = 0 значит надо решить уравнение:coth ( x ) − 1 x = 0 \coth{\left (x \right )} - \frac{1}{x} = 0 coth ( x ) − x 1 = 0 Решаем это уравнение Точки пересечения с осью X:Численное решение x 1 = 8.77433923293 ⋅ 1 0 − 7 x_{1} = 8.77433923293 \cdot 10^{-7} x 1 = 8.77433923293 ⋅ 1 0 − 7 x 2 = − 8.88255248541 ⋅ 1 0 − 7 x_{2} = -8.88255248541 \cdot 10^{-7} x 2 = − 8.88255248541 ⋅ 1 0 − 7 x 3 = − 8.84794347541 ⋅ 1 0 − 7 x_{3} = -8.84794347541 \cdot 10^{-7} x 3 = − 8.84794347541 ⋅ 1 0 − 7 x 4 = 8.88320713643 ⋅ 1 0 − 7 x_{4} = 8.88320713643 \cdot 10^{-7} x 4 = 8.88320713643 ⋅ 1 0 − 7 x 5 = 8.86184578832 ⋅ 1 0 − 7 x_{5} = 8.86184578832 \cdot 10^{-7} x 5 = 8.86184578832 ⋅ 1 0 − 7 x 6 = − 8.82663591186 ⋅ 1 0 − 7 x_{6} = -8.82663591186 \cdot 10^{-7} x 6 = − 8.82663591186 ⋅ 1 0 − 7 x 7 = 8.87662632408 ⋅ 1 0 − 7 x_{7} = 8.87662632408 \cdot 10^{-7} x 7 = 8.87662632408 ⋅ 1 0 − 7 x 8 = − 8.79547397121 ⋅ 1 0 − 7 x_{8} = -8.79547397121 \cdot 10^{-7} x 8 = − 8.79547397121 ⋅ 1 0 − 7 x 9 = 8.8721407875 ⋅ 1 0 − 7 x_{9} = 8.8721407875 \cdot 10^{-7} x 9 = 8.8721407875 ⋅ 1 0 − 7 x 10 = 8.88373503711 ⋅ 1 0 − 7 x_{10} = 8.88373503711 \cdot 10^{-7} x 10 = 8.88373503711 ⋅ 1 0 − 7 x 11 = 8.88139656131 ⋅ 1 0 − 7 x_{11} = 8.88139656131 \cdot 10^{-7} x 11 = 8.88139656131 ⋅ 1 0 − 7 x 12 = − 8.86969580459 ⋅ 1 0 − 7 x_{12} = -8.86969580459 \cdot 10^{-7} x 12 = − 8.86969580459 ⋅ 1 0 − 7 x 13 = 8.86733145663 ⋅ 1 0 − 7 x_{13} = 8.86733145663 \cdot 10^{-7} x 13 = 8.86733145663 ⋅ 1 0 − 7 x 14 = 8.86392761015 ⋅ 1 0 − 7 x_{14} = 8.86392761015 \cdot 10^{-7} x 14 = 8.86392761015 ⋅ 1 0 − 7 x 15 = − 8.8827641727 ⋅ 1 0 − 7 x_{15} = -8.8827641727 \cdot 10^{-7} x 15 = − 8.8827641727 ⋅ 1 0 − 7 x 16 = − 8.87852438817 ⋅ 1 0 − 7 x_{16} = -8.87852438817 \cdot 10^{-7} x 16 = − 8.87852438817 ⋅ 1 0 − 7 x 17 = 8.88111583482 ⋅ 1 0 − 7 x_{17} = 8.88111583482 \cdot 10^{-7} x 17 = 8.88111583482 ⋅ 1 0 − 7 x 18 = − 8.85580122845 ⋅ 1 0 − 7 x_{18} = -8.85580122845 \cdot 10^{-7} x 18 = − 8.85580122845 ⋅ 1 0 − 7 x 19 = − 6.56098394549 ⋅ 1 0 − 7 x_{19} = -6.56098394549 \cdot 10^{-7} x 19 = − 6.56098394549 ⋅ 1 0 − 7 x 20 = 8.88339052185 ⋅ 1 0 − 7 x_{20} = 8.88339052185 \cdot 10^{-7} x 20 = 8.88339052185 ⋅ 1 0 − 7 x 21 = − 8.88009006173 ⋅ 1 0 − 7 x_{21} = -8.88009006173 \cdot 10^{-7} x 21 = − 8.88009006173 ⋅ 1 0 − 7 x 22 = − 8.86343466325 ⋅ 1 0 − 7 x_{22} = -8.86343466325 \cdot 10^{-7} x 22 = − 8.86343466325 ⋅ 1 0 − 7 x 23 = − 8.87935586376 ⋅ 1 0 − 7 x_{23} = -8.87935586376 \cdot 10^{-7} x 23 = − 8.87935586376 ⋅ 1 0 − 7 x 24 = 8.88081970066 ⋅ 1 0 − 7 x_{24} = 8.88081970066 \cdot 10^{-7} x 24 = 8.88081970066 ⋅ 1 0 − 7 x 25 = − 8.87520500998 ⋅ 1 0 − 7 x_{25} = -8.87520500998 \cdot 10^{-7} x 25 = − 8.87520500998 ⋅ 1 0 − 7 x 26 = 8.53473540641 ⋅ 1 0 − 7 x_{26} = 8.53473540641 \cdot 10^{-7} x 26 = 8.53473540641 ⋅ 1 0 − 7 x 27 = − 8.87448478416 ⋅ 1 0 − 7 x_{27} = -8.87448478416 \cdot 10^{-7} x 27 = − 8.87448478416 ⋅ 1 0 − 7 x 28 = 8.88215744891 ⋅ 1 0 − 7 x_{28} = 8.88215744891 \cdot 10^{-7} x 28 = 8.88215744891 ⋅ 1 0 − 7 x 29 = − 8.88352306623 ⋅ 1 0 − 7 x_{29} = -8.88352306623 \cdot 10^{-7} x 29 = − 8.88352306623 ⋅ 1 0 − 7 x 30 = 8.87602566764 ⋅ 1 0 − 7 x_{30} = 8.87602566764 \cdot 10^{-7} x 30 = 8.87602566764 ⋅ 1 0 − 7 x 31 = 8.87863429787 ⋅ 1 0 − 7 x_{31} = 8.87863429787 \cdot 10^{-7} x 31 = 8.87863429787 ⋅ 1 0 − 7 x 32 = 8.88301567942 ⋅ 1 0 − 7 x_{32} = 8.88301567942 \cdot 10^{-7} x 32 = 8.88301567942 ⋅ 1 0 − 7 x 33 = 8.86874061482 ⋅ 1 0 − 7 x_{33} = 8.86874061482 \cdot 10^{-7} x 33 = 8.86874061482 ⋅ 1 0 − 7 x 34 = − 8.87284039698 ⋅ 1 0 − 7 x_{34} = -8.87284039698 \cdot 10^{-7} x 34 = − 8.87284039698 ⋅ 1 0 − 7 x 35 = − 8.88296649119 ⋅ 1 0 − 7 x_{35} = -8.88296649119 \cdot 10^{-7} x 35 = − 8.88296649119 ⋅ 1 0 − 7 x 36 = 8.87905645725 ⋅ 1 0 − 7 x_{36} = 8.87905645725 \cdot 10^{-7} x 36 = 8.87905645725 ⋅ 1 0 − 7 x 37 = − 8.8758680519 ⋅ 1 0 − 7 x_{37} = -8.8758680519 \cdot 10^{-7} x 37 = − 8.8758680519 ⋅ 1 0 − 7 x 38 = 8.72289882022 ⋅ 1 0 − 7 x_{38} = 8.72289882022 \cdot 10^{-7} x 38 = 8.72289882022 ⋅ 1 0 − 7 x 39 = − 8.81405911237 ⋅ 1 0 − 7 x_{39} = -8.81405911237 \cdot 10^{-7} x 39 = − 8.81405911237 ⋅ 1 0 − 7 x 40 = − 8.87189603381 ⋅ 1 0 − 7 x_{40} = -8.87189603381 \cdot 10^{-7} x 40 = − 8.87189603381 ⋅ 1 0 − 7 x 41 = − 8.88209827494 ⋅ 1 0 − 7 x_{41} = -8.88209827494 \cdot 10^{-7} x 41 = − 8.88209827494 ⋅ 1 0 − 7 x 42 = 8.86999693438 ⋅ 1 0 − 7 x_{42} = 8.86999693438 \cdot 10^{-7} x 42 = 8.86999693438 ⋅ 1 0 − 7 x 43 = − 8.88074310999 ⋅ 1 0 − 7 x_{43} = -8.88074310999 \cdot 10^{-7} x 43 = − 8.88074310999 ⋅ 1 0 − 7 x 44 = 8.87770091532 ⋅ 1 0 − 7 x_{44} = 8.87770091532 \cdot 10^{-7} x 44 = 8.87770091532 ⋅ 1 0 − 7 x 45 = − 8.87806592267 ⋅ 1 0 − 7 x_{45} = -8.87806592267 \cdot 10^{-7} x 45 = − 8.87806592267 ⋅ 1 0 − 7 x 46 = 8.8801758407 ⋅ 1 0 − 7 x_{46} = 8.8801758407 \cdot 10^{-7} x 46 = 8.8801758407 ⋅ 1 0 − 7 x 47 = 8.86573976285 ⋅ 1 0 − 7 x_{47} = 8.86573976285 \cdot 10^{-7} x 47 = 8.86573976285 ⋅ 1 0 − 7 x 48 = − 8.87085324725 ⋅ 1 0 − 7 x_{48} = -8.87085324725 \cdot 10^{-7} x 48 = − 8.87085324725 ⋅ 1 0 − 7 x 49 = − 8.86530909351 ⋅ 1 0 − 7 x_{49} = -8.86530909351 \cdot 10^{-7} x 49 = − 8.86530909351 ⋅ 1 0 − 7 x 50 = 8.88260632094 ⋅ 1 0 − 7 x_{50} = 8.88260632094 \cdot 10^{-7} x 50 = 8.88260632094 ⋅ 1 0 − 7 x 51 = − 8.83571413976 ⋅ 1 0 − 7 x_{51} = -8.83571413976 \cdot 10^{-7} x 51 = − 8.83571413976 ⋅ 1 0 − 7 x 52 = − 8.76507213144 ⋅ 1 0 − 7 x_{52} = -8.76507213144 \cdot 10^{-7} x 52 = − 8.76507213144 ⋅ 1 0 − 7 x 53 = − 8.8804258648 ⋅ 1 0 − 7 x_{53} = -8.8804258648 \cdot 10^{-7} x 53 = − 8.8804258648 ⋅ 1 0 − 7 x 54 = 8.87467060185 ⋅ 1 0 − 7 x_{54} = 8.87467060185 \cdot 10^{-7} x 54 = 8.87467060185 ⋅ 1 0 − 7 x 55 = 8.81763681751 ⋅ 1 0 − 7 x_{55} = 8.81763681751 \cdot 10^{-7} x 55 = 8.81763681751 ⋅ 1 0 − 7 x 56 = 8.85320738508 ⋅ 1 0 − 7 x_{56} = 8.85320738508 \cdot 10^{-7} x 56 = 8.85320738508 ⋅ 1 0 − 7 x 57 = 8.88050685453 ⋅ 1 0 − 7 x_{57} = 8.88050685453 \cdot 10^{-7} x 57 = 8.88050685453 ⋅ 1 0 − 7 x 58 = − 8.88316004936 ⋅ 1 0 − 7 x_{58} = -8.88316004936 \cdot 10^{-7} x 58 = − 8.88316004936 ⋅ 1 0 − 7 x 59 = 8.87112400172 ⋅ 1 0 − 7 x_{59} = 8.87112400172 \cdot 10^{-7} x 59 = 8.87112400172 ⋅ 1 0 − 7 x 60 = − 8.87648046023 ⋅ 1 0 − 7 x_{60} = -8.87648046023 \cdot 10^{-7} x 60 = − 8.87648046023 ⋅ 1 0 − 7 x 61 = − 8.87895345525 ⋅ 1 0 − 7 x_{61} = -8.87895345525 \cdot 10^{-7} x 61 = − 8.87895345525 ⋅ 1 0 − 7 x 62 = − 8.87973402334 ⋅ 1 0 − 7 x_{62} = -8.87973402334 \cdot 10^{-7} x 62 = − 8.87973402334 ⋅ 1 0 − 7 x 63 = − 8.70231217996 ⋅ 1 0 − 7 x_{63} = -8.70231217996 \cdot 10^{-7} x 63 = − 8.70231217996 ⋅ 1 0 − 7 x 64 = − 8.84257542265 ⋅ 1 0 − 7 x_{64} = -8.84257542265 \cdot 10^{-7} x 64 = − 8.84257542265 ⋅ 1 0 − 7 x 65 = − 8.85225791996 ⋅ 1 0 − 7 x_{65} = -8.85225791996 \cdot 10^{-7} x 65 = − 8.85225791996 ⋅ 1 0 − 7 x 66 = 8.88281560595 ⋅ 1 0 − 7 x_{66} = 8.88281560595 \cdot 10^{-7} x 66 = 8.88281560595 ⋅ 1 0 − 7 x 67 = 8.83760237918 ⋅ 1 0 − 7 x_{67} = 8.83760237918 \cdot 10^{-7} x 67 = 8.83760237918 ⋅ 1 0 − 7 x 68 = 8.87945258939 ⋅ 1 0 − 7 x_{68} = 8.87945258939 \cdot 10^{-7} x 68 = 8.87945258939 ⋅ 1 0 − 7 x 69 = − 8.86840369583 ⋅ 1 0 − 7 x_{69} = -8.86840369583 \cdot 10^{-7} x 69 = − 8.86840369583 ⋅ 1 0 − 7 x 70 = 8.87718320058 ⋅ 1 0 − 7 x_{70} = 8.87718320058 \cdot 10^{-7} x 70 = 8.87718320058 ⋅ 1 0 − 7 x 71 = 8.80090551503 ⋅ 1 0 − 7 x_{71} = 8.80090551503 \cdot 10^{-7} x 71 = 8.80090551503 ⋅ 1 0 − 7 x 72 = 8.87390248892 ⋅ 1 0 − 7 x_{72} = 8.87390248892 \cdot 10^{-7} x 72 = 8.87390248892 ⋅ 1 0 − 7 x 73 = 8.85942926378 ⋅ 1 0 − 7 x_{73} = 8.85942926378 \cdot 10^{-7} x 73 = 8.85942926378 ⋅ 1 0 − 7 x 74 = − 8.88334540415 ⋅ 1 0 − 7 x_{74} = -8.88334540415 \cdot 10^{-7} x 74 = − 8.88334540415 ⋅ 1 0 − 7 x 75 = 8.84910778271 ⋅ 1 0 − 7 x_{75} = 8.84910778271 \cdot 10^{-7} x 75 = 8.84910778271 ⋅ 1 0 − 7 x 76 = 7.13248901292 ⋅ 1 0 − 7 x_{76} = 7.13248901292 \cdot 10^{-7} x 76 = 7.13248901292 ⋅ 1 0 − 7 x 77 = − 8.86127600929 ⋅ 1 0 − 7 x_{77} = -8.86127600929 \cdot 10^{-7} x 77 = − 8.86127600929 ⋅ 1 0 − 7 x 78 = − 8.44583650459 ⋅ 1 0 − 7 x_{78} = -8.44583650459 \cdot 10^{-7} x 78 = − 8.44583650459 ⋅ 1 0 − 7 x 79 = − 8.87757493013 ⋅ 1 0 − 7 x_{79} = -8.87757493013 \cdot 10^{-7} x 79 = − 8.87757493013 ⋅ 1 0 − 7 x 80 = 8.87982502927 ⋅ 1 0 − 7 x_{80} = 8.87982502927 \cdot 10^{-7} x 80 = 8.87982502927 ⋅ 1 0 − 7 x 81 = 8.88191636325 ⋅ 1 0 − 7 x_{81} = 8.88191636325 \cdot 10^{-7} x 81 = 8.88191636325 ⋅ 1 0 − 7 x 82 = − 8.88233076312 ⋅ 1 0 − 7 x_{82} = -8.88233076312 \cdot 10^{-7} x 82 = − 8.88233076312 ⋅ 1 0 − 7 x 83 = 8.87537585726 ⋅ 1 0 − 7 x_{83} = 8.87537585726 \cdot 10^{-7} x 83 = 8.87537585726 ⋅ 1 0 − 7 x 84 = − 8.87369964332 ⋅ 1 0 − 7 x_{84} = -8.87369964332 \cdot 10^{-7} x 84 = − 8.87369964332 ⋅ 1 0 − 7 x 85 = − 8.86695196715 ⋅ 1 0 − 7 x_{85} = -8.86695196715 \cdot 10^{-7} x 85 = − 8.86695196715 ⋅ 1 0 − 7 x 86 = − 8.8815977044 ⋅ 1 0 − 7 x_{86} = -8.8815977044 \cdot 10^{-7} x 86 = − 8.8815977044 ⋅ 1 0 − 7 x 87 = 8.8835663356 ⋅ 1 0 − 7 x_{87} = 8.8835663356 \cdot 10^{-7} x 87 = 8.8835663356 ⋅ 1 0 − 7 x 88 = − 8.88132775797 ⋅ 1 0 − 7 x_{88} = -8.88132775797 \cdot 10^{-7} x 88 = − 8.88132775797 ⋅ 1 0 − 7 x 89 = 8.8291697863 ⋅ 1 0 − 7 x_{89} = 8.8291697863 \cdot 10^{-7} x 89 = 8.8291697863 ⋅ 1 0 − 7 x 90 = − 8.88185421725 ⋅ 1 0 − 7 x_{90} = -8.88185421725 \cdot 10^{-7} x 90 = − 8.88185421725 ⋅ 1 0 − 7 x 91 = − 8.87704782166 ⋅ 1 0 − 7 x_{91} = -8.87704782166 \cdot 10^{-7} x 91 = − 8.87704782166 ⋅ 1 0 − 7 x 92 = − 8.88369350478 ⋅ 1 0 − 7 x_{92} = -8.88369350478 \cdot 10^{-7} x 92 = − 8.88369350478 ⋅ 1 0 − 7 x 93 = 8.8816630521 ⋅ 1 0 − 7 x_{93} = 8.8816630521 \cdot 10^{-7} x 93 = 8.8816630521 ⋅ 1 0 − 7 x 94 = 8.85659026363 ⋅ 1 0 − 7 x_{94} = 8.85659026363 \cdot 10^{-7} x 94 = 8.85659026363 ⋅ 1 0 − 7 x 95 = 8.88238717327 ⋅ 1 0 − 7 x_{95} = 8.88238717327 \cdot 10^{-7} x 95 = 8.88238717327 ⋅ 1 0 − 7 x 96 = 8.87818345898 ⋅ 1 0 − 7 x_{96} = 8.87818345898 \cdot 10^{-7} x 96 = 8.87818345898 ⋅ 1 0 − 7 x 97 = 8.87306272303 ⋅ 1 0 − 7 x_{97} = 8.87306272303 \cdot 10^{-7} x 97 = 8.87306272303 ⋅ 1 0 − 7 x 98 = 8.84403669268 ⋅ 1 0 − 7 x_{98} = 8.84403669268 \cdot 10^{-7} x 98 = 8.84403669268 ⋅ 1 0 − 7 x 99 = − 8.8810432943 ⋅ 1 0 − 7 x_{99} = -8.8810432943 \cdot 10^{-7} x 99 = − 8.8810432943 ⋅ 1 0 − 7 x 100 = − 8.85876318231 ⋅ 1 0 − 7 x_{100} = -8.85876318231 \cdot 10^{-7} x 100 = − 8.85876318231 ⋅ 1 0 − 7
Горизонтальные асимптоты
Горизонтальные асимптоты найдём с помощью пределов данной функции при x->+oo и x->-oolim x → − ∞ ( coth ( x ) − 1 x ) = − 1 \lim_{x \to -\infty}\left(\coth{\left (x \right )} - \frac{1}{x}\right) = -1 x → − ∞ lim ( coth ( x ) − x 1 ) = − 1 Возьмём предел значит, уравнение горизонтальной асимптоты слева:y = − 1 y = -1 y = − 1 lim x → ∞ ( coth ( x ) − 1 x ) = 1 \lim_{x \to \infty}\left(\coth{\left (x \right )} - \frac{1}{x}\right) = 1 x → ∞ lim ( coth ( x ) − x 1 ) = 1 Возьмём предел значит, уравнение горизонтальной асимптоты справа:y = 1 y = 1 y = 1
Наклонные асимптоты
Наклонную асимптоту можно найти, подсчитав предел функции coth(x) - 1/x, делённой на x при x->+oo и x ->-oolim x → − ∞ ( 1 x ( coth ( x ) − 1 x ) ) = 0 \lim_{x \to -\infty}\left(\frac{1}{x} \left(\coth{\left (x \right )} - \frac{1}{x}\right)\right) = 0 x → − ∞ lim ( x 1 ( coth ( x ) − x 1 ) ) = 0 Возьмём предел значит, наклонная совпадает с горизонтальной асимптотой справаlim x → ∞ ( 1 x ( coth ( x ) − 1 x ) ) = 0 \lim_{x \to \infty}\left(\frac{1}{x} \left(\coth{\left (x \right )} - \frac{1}{x}\right)\right) = 0 x → ∞ lim ( x 1 ( coth ( x ) − x 1 ) ) = 0 Возьмём предел значит, наклонная совпадает с горизонтальной асимптотой слева
Чётность и нечётность функции
Проверим функци чётна или нечётна с помощью соотношений f = f(-x) и f = -f(-x). Итак, проверяем:coth ( x ) − 1 x = − coth ( x ) + 1 x \coth{\left (x \right )} - \frac{1}{x} = - \coth{\left (x \right )} + \frac{1}{x} coth ( x ) − x 1 = − coth ( x ) + x 1 - Нетcoth ( x ) − 1 x = − − 1 coth ( x ) − 1 x \coth{\left (x \right )} - \frac{1}{x} = - -1 \coth{\left (x \right )} - \frac{1}{x} coth ( x ) − x 1 = − − 1 coth ( x ) − x 1 - Нет значит, функция не является ни чётной ни нечётной