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Simplifying f(x) = 3cos(2x) + -1 Multiply f * x fx = 3cos(2x) + -1 Remove parenthesis around (2x) fx = 3cos * 2x + -1 Reorder the terms for easier multiplication: fx = 3 * 2cos * x + -1 Multiply 3 * 2 fx = 6cos * x + -1 Multiply cos * x fx = 6cosx + -1 Reorder the terms: fx = -1 + 6cosx Solving fx = -1 + 6cosx Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = -1x-1 + 6cos Simplifying f = -1x-1 + 6cos Reorder the terms: f = 6cos + -1x-1
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