cos(x)=корень2/2 (уравнение)

Найду корень уравнения: cos(x)=корень2/2

Вы ввели

           ___
         \/ 2 
cos(x) = -----
           2  

$$\cos{\left(x \right)} = \frac{\sqrt{2}}{2}$$

Подробное решение

Дано уравнение
$$\cos{\left(x \right)} = \frac{\sqrt{2}}{2}$$
- это простейшее тригонометрическое ур-ние
Это ур-ние преобразуется в
$$x = \pi n + \operatorname{acos}{\left(\frac{\sqrt{2}}{2} \right)}$$
$$x = \pi n - \pi + \operatorname{acos}{\left(\frac{\sqrt{2}}{2} \right)}$$
Или
$$x = \pi n + \frac{\pi}{4}$$
$$x = \pi n - \frac{3 \pi}{4}$$
, где n - любое целое число

Быстрый ответ

     pi
x1 = --
     4 

$$x_{1} = \frac{\pi}{4}$$

     7*pi
x2 = ----
      4  

$$x_{2} = \frac{7 \pi}{4}$$

Сумма и произведение корней

сумма

    pi   7*pi
0 + -- + ----
    4     4  

$$\left(0 + \frac{\pi}{4}\right) + \frac{7 \pi}{4}$$

=

2*pi

$$2 \pi$$

произведение

  pi 7*pi
1*--*----
  4   4  

$$\frac{7 \pi}{4} \cdot 1 \frac{\pi}{4}$$

=

    2
7*pi 
-----
  16 

$$\frac{7 \pi^{2}}{16}$$

Численный ответ

x1 = 25.9181393921158

x2 = -0.785398163397448

x3 = -68.329640215578

x4 = 11.7809724509617

x5 = -55.7632696012188

x6 = 18.0641577581413

x7 = -62.0464549083984

x8 = -99.7455667514759

x9 = -63.6172512351933

x10 = 5.49778714378214

x11 = 49.4800842940392

x12 = 82.4668071567321

x13 = -11.7809724509617

x14 = 51.0508806208341

x15 = 93.4623814442964

x16 = 80.8960108299372

x17 = -19.6349540849362

x18 = 43.1968989868597

x19 = 24.3473430653209

x20 = -36.9137136796801

x21 = 88.7499924639117

x22 = 38.484510006475

x23 = -93.4623814442964

x24 = -162.577419823272

x25 = 68.329640215578

x26 = 44.7676953136546

x27 = 13.3517687777566

x28 = -82.4668071567321

x29 = -76.1836218495525

x30 = 62.0464549083984

x31 = -32.2013246992954

x32 = 95.0331777710912

x33 = 69.9004365423729

x34 = -182.997772071605

x35 = -25.9181393921158

x36 = 55.7632696012188

x37 = -18.0641577581413

x38 = -74.6128255227576

x39 = -49.4800842940392

x40 = -38.484510006475

x41 = -57.3340659280137

x42 = 74.6128255227576

x43 = -24.3473430653209

x44 = 57.3340659280137

x45 = 99.7455667514759

x46 = -95.0331777710912

x47 = -351.072979038659

x48 = 0.785398163397448

x49 = 19.6349540849362

x50 = -43.1968989868597

x51 = -13.3517687777566

x52 = -69.9004365423729

x53 = -101.316363078271

x54 = -44.7676953136546

x55 = -7.06858347057703

x56 = -88.7499924639117

x57 = 87.1791961371168

x58 = 32.2013246992954

x59 = 63.6172512351933

x60 = -51.0508806208341

x61 = -5.49778714378214

x62 = 36.9137136796801

x63 = 7.06858347057703

x64 = -30.6305283725005

x65 = 30.6305283725005

x66 = -87.1791961371168

x67 = -80.8960108299372

x68 = 76.1836218495525

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