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Simplifying 2cos2(2x) + -7cos(2x) + -9 = 0 Remove parenthesis around (2x) 2cos2 * 2x + -7cos(2x) + -9 = 0 Reorder the terms for easier multiplication: 2 * 2cos2 * x + -7cos(2x) + -9 = 0 Multiply 2 * 2 4cos2 * x + -7cos(2x) + -9 = 0 Multiply cos2 * x 4cos2x + -7cos(2x) + -9 = 0 Remove parenthesis around (2x) 4cos2x + -7cos * 2x + -9 = 0 Reorder the terms for easier multiplication: 4cos2x + -7 * 2cos * x + -9 = 0 Multiply -7 * 2 4cos2x + -14cos * x + -9 = 0 Multiply cos * x 4cos2x + -14cosx + -9 = 0 Reorder the terms: -9 + -14cosx + 4cos2x = 0 Solving -9 + -14cosx + 4cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '9' to each side of the equation. -9 + -14cosx + 9 + 4cos2x = 0 + 9 Reorder the terms: -9 + 9 + -14cosx + 4cos2x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -14cosx + 4cos2x = 0 + 9 -14cosx + 4cos2x = 0 + 9 Combine like terms: 0 + 9 = 9 -14cosx + 4cos2x = 9 Reorder the terms: -9 + -14cosx + 4cos2x = 9 + -9 Combine like terms: 9 + -9 = 0 -9 + -14cosx + 4cos2x = 0 The solution to this equation could not be determined.
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