3=2cos^2(x)-5cos(x)

Solution for 3=2cos^2(x)-5cos(x) equation:

Simplifying
3 = 2cos2(x) + -5cos(x)

Multiply cos2 * x
3 = 2cos2x + -5cos(x)

Multiply cos * x
3 = 2cos2x + -5cosx

Reorder the terms:
3 = -5cosx + 2cos2x

Solving
3 = -5cosx + 2cos2x

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Add '5cosx' to each side of the equation.
3 + 5cosx = -5cosx + 5cosx + 2cos2x

Combine like terms: -5cosx + 5cosx = 0
3 + 5cosx = 0 + 2cos2x
3 + 5cosx = 2cos2x

Add '-2cos2x' to each side of the equation.
3 + 5cosx + -2cos2x = 2cos2x + -2cos2x

Combine like terms: 2cos2x + -2cos2x = 0
3 + 5cosx + -2cos2x = 0

Add '-3' to each side of the equation.
3 + 5cosx + -3 + -2cos2x = 0 + -3

Reorder the terms:
3 + -3 + 5cosx + -2cos2x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 5cosx + -2cos2x = 0 + -3
5cosx + -2cos2x = 0 + -3

Combine like terms: 0 + -3 = -3
5cosx + -2cos2x = -3

Reorder the terms:
3 + 5cosx + -2cos2x = -3 + 3

Combine like terms: -3 + 3 = 0
3 + 5cosx + -2cos2x = 0

The solution to this equation could not be determined.