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Simplifying cos(2x) = 0.9 Remove parenthesis around (2x) cos * 2x = 0.9 Reorder the terms for easier multiplication: 2cos * x = 0.9 Multiply cos * x 2cosx = 0.9 Solving 2cosx = 0.9 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '2osx'. c = 0.45o-1s-1x-1 Simplifying c = 0.45o-1s-1x-1
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