f(t)=-2*cos(2t)

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Solution for f(t)=-2*cos(2t) equation: 


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

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

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

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

Multiply -2 * 2
ft = -4cos * t

Multiply cos * t
ft = -4cost

Solving
ft = -4cost

Solving for variable 'f'.

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

Divide each side by 't'.
f = -4cos

Simplifying
f = -4cos

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