cos(x)=-cos(2x)

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Solution for cos(x)=-cos(2x) equation:


Simplifying
cos(x) = -1cos(2x)

Multiply cos * x
cosx = -1cos(2x)

Remove parenthesis around (2x)
cosx = -1cos * 2x

Reorder the terms for easier multiplication:
cosx = -1 * 2cos * x

Multiply -1 * 2
cosx = -2cos * x

Multiply cos * x
cosx = -2cosx

Solving
cosx = -2cosx

Solving for variable 'c'.

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

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

Combine like terms: cosx + 2cosx = 3cosx
3cosx = -2cosx + 2cosx

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

Divide each side by '3'.
cosx = 0

Simplifying
cosx = 0

The solution to this equation could not be determined.

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