Найду корень уравнения: tan(-x)=4
Разделим обе части ур-ния на -1
x1 = -13.8921882780272
x2 = 52.0812574473585
x3 = -35.8833368531558
x4 = -29.6001515459762
x5 = 80.3555913296666
x6 = 58.364442754538
x7 = 23.8069235650503
x8 = -73.5824486962333
x9 = -57.8744854282843
x10 = 30.0901088722299
x11 = 96.0635545976156
x12 = -7.60900297084762
x13 = -51.5913001211047
x14 = 36.3732941794095
x15 = -79.8656340034129
x16 = 121.196295826334
x17 = -7871.0154149061
x18 = 74.072406022487
x19 = -1.32581766366803
x20 = 14.3821456042809
x21 = 8.09896029710135