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Simplifying cos(x) + 3cos(2x) = 3 Multiply cos * x cosx + 3cos(2x) = 3 Remove parenthesis around (2x) cosx + 3cos * 2x = 3 Reorder the terms for easier multiplication: cosx + 3 * 2cos * x = 3 Multiply 3 * 2 cosx + 6cos * x = 3 Multiply cos * x cosx + 6cosx = 3 Combine like terms: cosx + 6cosx = 7cosx 7cosx = 3 Solving 7cosx = 3 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '7osx'. c = 0.4285714286o-1s-1x-1 Simplifying c = 0.4285714286o-1s-1x-1
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