f(y)=cos(2y)

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Solution for f(y)=cos(2y) equation: 


Simplifying
f(y) = cos(2y)

Multiply f * y
fy = cos(2y)

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

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

Multiply cos * y
fy = 2cosy

Solving
fy = 2cosy

Solving for variable 'f'.

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

Divide each side by 'y'.
f = 2cos

Simplifying
f = 2cos

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