f(x)=5cos(2x)

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Solution for f(x)=5cos(2x) equation: 


Simplifying
f(x) = 5cos(2x)

Multiply f * x
fx = 5cos(2x)

Remove parenthesis around (2x)
fx = 5cos * 2x

Reorder the terms for easier multiplication:
fx = 5 * 2cos * x

Multiply 5 * 2
fx = 10cos * x

Multiply cos * x
fx = 10cosx

Solving
fx = 10cosx

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 10cos

Simplifying
f = 10cos

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