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Simplifying y = cos4(5x) Remove parenthesis around (5x) y = cos4 * 5x Reorder the terms for easier multiplication: y = 5cos4 * x Multiply cos4 * x y = 5cos4x Solving y = 5cos4x Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Simplifying y = 5cos4x
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