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Simplifying 3cos(2x) + -5cos(x) = 0 Remove parenthesis around (2x) 3cos * 2x + -5cos(x) = 0 Reorder the terms for easier multiplication: 3 * 2cos * x + -5cos(x) = 0 Multiply 3 * 2 6cos * x + -5cos(x) = 0 Multiply cos * x 6cosx + -5cos(x) = 0 Multiply cos * x 6cosx + -5cosx = 0 Combine like terms: 6cosx + -5cosx = 1cosx 1cosx = 0 Solving 1cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '1'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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