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Simplifying cos2(2x) = 0.8 Remove parenthesis around (2x) cos2 * 2x = 0.8 Reorder the terms for easier multiplication: 2cos2 * x = 0.8 Multiply cos2 * x 2cos2x = 0.8 Solving 2cos2x = 0.8 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '2os2x'. c = 0.4o-1s-2x-1 Simplifying c = 0.4o-1s-2x-1
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