f(x)=4cos(-5x)

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Solution for f(x)=4cos(-5x) equation: 


Simplifying
f(x) = 4cos(-5x)

Multiply f * x
fx = 4cos(-5x)

Remove parenthesis around (-5x)
fx = 4cos * -5x

Reorder the terms for easier multiplication:
fx = 4 * -5cos * x

Multiply 4 * -5
fx = -20cos * x

Multiply cos * x
fx = -20cosx

Solving
fx = -20cosx

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -20cos

Simplifying
f = -20cos

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