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Simplifying f(x) = 4 + -1cos(4x) Multiply f * x fx = 4 + -1cos(4x) Remove parenthesis around (4x) fx = 4 + -1cos * 4x Reorder the terms for easier multiplication: fx = 4 + -1 * 4cos * x Multiply -1 * 4 fx = 4 + -4cos * x Multiply cos * x fx = 4 + -4cosx Solving fx = 4 + -4cosx Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = 4x-1 + -4cos Simplifying f = 4x-1 + -4cos Reorder the terms: f = -4cos + 4x-1
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