Mister Exam

Other calculators


cos(x)-1/2=0

cos(x)-1/2=0 equation

The teacher will be very surprised to see your correct solution 😉

v

Numerical solution:

Do search numerical solution at [, ]

The solution

You have entered [src]
cos(x) - 1/2 = 0
$$\cos{\left(x \right)} - \frac{1}{2} = 0$$
Detail solution
Given the equation
$$\cos{\left(x \right)} - \frac{1}{2} = 0$$
- this is the simplest trigonometric equation
Move -1/2 to right part of the equation

with the change of sign in -1/2

We get:
$$\cos{\left(x \right)} - \frac{1}{2} + \frac{1}{2} = \frac{1}{2}$$
This equation is transformed to
$$x = \pi n + \operatorname{acos}{\left(\frac{1}{2} \right)}$$
$$x = \pi n - \pi + \operatorname{acos}{\left(\frac{1}{2} \right)}$$
Or
$$x = \pi n + \frac{\pi}{3}$$
$$x = \pi n - \frac{2 \pi}{3}$$
, where n - is a integer
The graph
Sum and product of roots [src]
sum
pi   5*pi
-- + ----
3     3  
$$\left(\frac{\pi}{3}\right) + \left(\frac{5 \pi}{3}\right)$$
=
2*pi
$$2 \pi$$
product
pi   5*pi
-- * ----
3     3  
$$\left(\frac{\pi}{3}\right) * \left(\frac{5 \pi}{3}\right)$$
=
    2
5*pi 
-----
  9  
$$\frac{5 \pi^{2}}{9}$$
Rapid solution [src]
      pi
x_1 = --
      3 
$$x_{1} = \frac{\pi}{3}$$
      5*pi
x_2 = ----
       3  
$$x_{2} = \frac{5 \pi}{3}$$
Numerical answer [src]
x1 = -93.2005820564972
x2 = 24.0855436775217
x3 = 55.5014702134197
x4 = 89.0117918517108
x5 = -26.1799387799149
x6 = -61.7846555205993
x7 = -55.5014702134197
x8 = -51.3126800086333
x9 = -95.2949771588904
x10 = -11.5191730631626
x11 = -63.8790506229925
x12 = 86.9173967493176
x13 = 30.3687289847013
x14 = 63.8790506229925
x15 = 95.2949771588904
x16 = 7.33038285837618
x17 = 19.8967534727354
x18 = 51.3126800086333
x19 = 45.0294947014537
x20 = 13.6135681655558
x21 = 26.1799387799149
x22 = 49.2182849062401
x23 = 1.0471975511966
x24 = 68.0678408277789
x25 = -7.33038285837618
x26 = -17.8023583703422
x27 = -30.3687289847013
x28 = -1.0471975511966
x29 = -80.634211442138
x30 = -49.2182849062401
x31 = -225.147473507269
x32 = 32.4631240870945
x33 = -45.0294947014537
x34 = -74.3510261349584
x35 = 70.162235930172
x36 = 93.2005820564972
x37 = -5.23598775598299
x38 = -89.0117918517108
x39 = 42.9350995990605
x40 = -13.6135681655558
x41 = -32.4631240870945
x42 = -42.9350995990605
x43 = -38.7463093942741
x44 = -24.0855436775217
x45 = 80.634211442138
x46 = 11.5191730631626
x47 = 82.7286065445312
x48 = -70.162235930172
x49 = -99.4837673636768
x50 = 5.23598775598299
x51 = -36.6519142918809
x52 = 38.7463093942741
x53 = -359.188760060433
x54 = -57.5958653158129
x55 = -68.0678408277789
x56 = 61.7846555205993
x57 = -82.7286065445312
x58 = 17.8023583703422
x59 = -76.4454212373516
x60 = -19.8967534727354
x61 = 76.4454212373516
x62 = 57.5958653158129
x63 = -86.9173967493176
x64 = 74.3510261349584
x65 = 99.4837673636768
x66 = 1651.43053823704
x67 = 36.6519142918809
x67 = 36.6519142918809
The graph
cos(x)-1/2=0 equation