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Simplifying cos(2x) + cos(5x) = 2 Remove parenthesis around (2x) cos * 2x + cos(5x) = 2 Reorder the terms for easier multiplication: 2cos * x + cos(5x) = 2 Multiply cos * x 2cosx + cos(5x) = 2 Remove parenthesis around (5x) 2cosx + cos * 5x = 2 Reorder the terms for easier multiplication: 2cosx + 5cos * x = 2 Multiply cos * x 2cosx + 5cosx = 2 Combine like terms: 2cosx + 5cosx = 7cosx 7cosx = 2 Solving 7cosx = 2 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '7osx'. c = 0.2857142857o-1s-1x-1 Simplifying c = 0.2857142857o-1s-1x-1
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