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Simplifying cos(6x) = 2cos2(3x) + -1 Remove parenthesis around (6x) cos * 6x = 2cos2(3x) + -1 Reorder the terms for easier multiplication: 6cos * x = 2cos2(3x) + -1 Multiply cos * x 6cosx = 2cos2(3x) + -1 Remove parenthesis around (3x) 6cosx = 2cos2 * 3x + -1 Reorder the terms for easier multiplication: 6cosx = 2 * 3cos2 * x + -1 Multiply 2 * 3 6cosx = 6cos2 * x + -1 Multiply cos2 * x 6cosx = 6cos2x + -1 Reorder the terms: 6cosx = -1 + 6cos2x Solving 6cosx = -1 + 6cos2x Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-6cos2x' to each side of the equation. 6cosx + -6cos2x = -1 + 6cos2x + -6cos2x Combine like terms: 6cos2x + -6cos2x = 0 6cosx + -6cos2x = -1 + 0 6cosx + -6cos2x = -1 Reorder the terms: 1 + 6cosx + -6cos2x = -1 + 1 Combine like terms: -1 + 1 = 0 1 + 6cosx + -6cos2x = 0 The solution to this equation could not be determined.
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