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Simplifying cos2(x) = 2 + -2sin(x) Multiply cos2 * x cos2x = 2 + -2sin(x) Multiply ins * x cos2x = 2 + -2insx Solving cos2x = 2 + -2insx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by 'os2x'. c = 2o-1s-2x-1 + -2ino-1s-1 Simplifying c = 2o-1s-2x-1 + -2ino-1s-1 Reorder the terms: c = -2ino-1s-1 + 2o-1s-2x-1
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