cos(2y)=cosy

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Solution for cos(2y)=cosy equation:


Simplifying
cos(2y) = cosy

Remove parenthesis around (2y)
cos * 2y = cosy

Reorder the terms for easier multiplication:
2cos * y = cosy

Multiply cos * y
2cosy = cosy

Solving
2cosy = cosy

Solving for variable 'c'.

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

Add '-1cosy' to each side of the equation.
2cosy + -1cosy = cosy + -1cosy

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

Combine like terms: cosy + -1cosy = 0
1cosy = 0

Divide each side by '1'.
cosy = 0

Simplifying
cosy = 0

The solution to this equation could not be determined.

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