f(x)=3cos(0.5x)

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Solution for f(x)=3cos(0.5x) equation: 


Simplifying
f(x) = 3cos(0.5x)

Multiply f * x
fx = 3cos(0.5x)

Remove parenthesis around (0.5x)
fx = 3cos * 0.5x

Reorder the terms for easier multiplication:
fx = 3 * 0.5cos * x

Multiply 3 * 0.5
fx = 1.5cos * x

Multiply cos * x
fx = 1.5cosx

Solving
fx = 1.5cosx

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 1.5cos

Simplifying
f = 1.5cos

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