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Simplifying cos(x) * cos(2x) = 0.5 Remove parenthesis around (2x) cos * x * cos * 2x = 0.5 Reorder the terms for easier multiplication: 2cos * x * cos * x = 0.5 Multiply cos * x 2cosx * cos * x = 0.5 Multiply cosx * cos 2c^{2}o^{2}s^{2}x * x = 0.5 Multiply c^{2}o^{2}s^{2}x * x 2c^{2}o^{2}s^{2}x^{2}= 0.5 Solving 2c^{2}o^{2}s^{2}x^{2}= 0.5 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '2o^{2}s^{2}x^{2}'. c^{2}= 0.25o^{-2}s^{-2}x^{-2}Simplifying c^{2}= 0.25o^{-2}s^{-2}x^{-2}Take the square root of each side: c = {-0.5o^{-1}s^{-1}x^{-1}, 0.5o^{-1}s^{-1}x^{-1}}

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