cos(2x)-3cosx=cosx

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


Simplifying
cos(2x) + -3cosx = cosx

Remove parenthesis around (2x)
cos * 2x + -3cosx = cosx

Reorder the terms for easier multiplication:
2cos * x + -3cosx = cosx

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

Combine like terms: 2cosx + -3cosx = -1cosx
-1cosx = cosx

Solving
-1cosx = cosx

Solving for variable 'c'.

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

Add '-1cosx' to each side of the equation.
-1cosx + -1cosx = cosx + -1cosx

Combine like terms: -1cosx + -1cosx = -2cosx
-2cosx = cosx + -1cosx

Combine like terms: cosx + -1cosx = 0
-2cosx = 0

Divide each side by '-2'.
cosx = 0

Simplifying
cosx = 0

The solution to this equation could not be determined.

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