f(x)=cos(3x)

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Solution for f(x)=cos(3x) equation: 


Simplifying
f(x) = cos(3x)

Multiply f * x
fx = cos(3x)

Remove parenthesis around (3x)
fx = cos * 3x

Reorder the terms for easier multiplication:
fx = 3cos * x

Multiply cos * x
fx = 3cosx

Solving
fx = 3cosx

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 3cos

Simplifying
f = 3cos

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