f(x)=cos(13x)

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Solution for f(x)=cos(13x) equation: 


Simplifying
f(x) = cos(13x)

Multiply f * x
fx = cos(13x)

Remove parenthesis around (13x)
fx = cos * 13x

Reorder the terms for easier multiplication:
fx = 13cos * x

Multiply cos * x
fx = 13cosx

Solving
fx = 13cosx

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 13cos

Simplifying
f = 13cos

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