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Simplifying cos2(x) + -8cos(x) + 15 = 0 Multiply cos2 * x cos2x + -8cos(x) + 15 = 0 Multiply cos * x cos2x + -8cosx + 15 = 0 Reorder the terms: 15 + -8cosx + cos2x = 0 Solving 15 + -8cosx + cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -8cosx + -15 + cos2x = 0 + -15 Reorder the terms: 15 + -15 + -8cosx + cos2x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -8cosx + cos2x = 0 + -15 -8cosx + cos2x = 0 + -15 Combine like terms: 0 + -15 = -15 -8cosx + cos2x = -15 Reorder the terms: 15 + -8cosx + cos2x = -15 + 15 Combine like terms: -15 + 15 = 0 15 + -8cosx + cos2x = 0 The solution to this equation could not be determined.
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