f(t)=3cos(2t)

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Solution for f(t)=3cos(2t) equation: 


Simplifying
f(t) = 3cos(2t)

Multiply f * t
ft = 3cos(2t)

Remove parenthesis around (2t)
ft = 3cos * 2t

Reorder the terms for easier multiplication:
ft = 3 * 2cos * t

Multiply 3 * 2
ft = 6cos * t

Multiply cos * t
ft = 6cost

Solving
ft = 6cost

Solving for variable 'f'.

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

Divide each side by 't'.
f = 6cos

Simplifying
f = 6cos

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