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Simplifying 9cos(2x) = 9cos2(x) + -4 Remove parenthesis around (2x) 9cos * 2x = 9cos2(x) + -4 Reorder the terms for easier multiplication: 9 * 2cos * x = 9cos2(x) + -4 Multiply 9 * 2 18cos * x = 9cos2(x) + -4 Multiply cos * x 18cosx = 9cos2(x) + -4 Multiply cos2 * x 18cosx = 9cos2x + -4 Reorder the terms: 18cosx = -4 + 9cos2x Solving 18cosx = -4 + 9cos2x Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-9cos2x' to each side of the equation. 18cosx + -9cos2x = -4 + 9cos2x + -9cos2x Combine like terms: 9cos2x + -9cos2x = 0 18cosx + -9cos2x = -4 + 0 18cosx + -9cos2x = -4 Reorder the terms: 4 + 18cosx + -9cos2x = -4 + 4 Combine like terms: -4 + 4 = 0 4 + 18cosx + -9cos2x = 0 The solution to this equation could not be determined.
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