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Simplifying cos(x) + 9cos(3x) = 0 Multiply cos * x cosx + 9cos(3x) = 0 Remove parenthesis around (3x) cosx + 9cos * 3x = 0 Reorder the terms for easier multiplication: cosx + 9 * 3cos * x = 0 Multiply 9 * 3 cosx + 27cos * x = 0 Multiply cos * x cosx + 27cosx = 0 Combine like terms: cosx + 27cosx = 28cosx 28cosx = 0 Solving 28cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '28'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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