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