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Simplifying f(x) = x3cos(8x) Multiply f * x fx = x3cos(8x) Remove parenthesis around (8x) fx = cosx3 * 8x Reorder the terms for easier multiplication: fx = 8cosx3 * x Multiply cosx3 * x fx = 8cosx4 Solving fx = 8cosx4 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = 8cosx3 Simplifying f = 8cosx3
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