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Simplifying f(x) = 3sin(x) + -4cos(2x) Multiply f * x fx = 3sin(x) + -4cos(2x) Multiply ins * x fx = 3insx + -4cos(2x) Remove parenthesis around (2x) fx = 3insx + -4cos * 2x Reorder the terms for easier multiplication: fx = 3insx + -4 * 2cos * x Multiply -4 * 2 fx = 3insx + -8cos * x Multiply cos * x fx = 3insx + -8cosx Reorder the terms: fx = -8cosx + 3insx Solving fx = -8cosx + 3insx Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = -8cos + 3ins Simplifying f = -8cos + 3ins
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