cos(2x)-2cosx=0

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Solution for cos(2x)-2cosx=0 equation: 


Simplifying
cos(2x) + -2cosx = 0

Remove parenthesis around (2x)
cos * 2x + -2cosx = 0

Reorder the terms for easier multiplication:
2cos * x + -2cosx = 0

Multiply cos * x
2cosx + -2cosx = 0

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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