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Simplifying 7cos2(2x) + 4cos(2x) + -3 = 0 Remove parenthesis around (2x) 7cos2 * 2x + 4cos(2x) + -3 = 0 Reorder the terms for easier multiplication: 7 * 2cos2 * x + 4cos(2x) + -3 = 0 Multiply 7 * 2 14cos2 * x + 4cos(2x) + -3 = 0 Multiply cos2 * x 14cos2x + 4cos(2x) + -3 = 0 Remove parenthesis around (2x) 14cos2x + 4cos * 2x + -3 = 0 Reorder the terms for easier multiplication: 14cos2x + 4 * 2cos * x + -3 = 0 Multiply 4 * 2 14cos2x + 8cos * x + -3 = 0 Multiply cos * x 14cos2x + 8cosx + -3 = 0 Reorder the terms: -3 + 8cosx + 14cos2x = 0 Solving -3 + 8cosx + 14cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 8cosx + 3 + 14cos2x = 0 + 3 Reorder the terms: -3 + 3 + 8cosx + 14cos2x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + 8cosx + 14cos2x = 0 + 3 8cosx + 14cos2x = 0 + 3 Combine like terms: 0 + 3 = 3 8cosx + 14cos2x = 3 Reorder the terms: -3 + 8cosx + 14cos2x = 3 + -3 Combine like terms: 3 + -3 = 0 -3 + 8cosx + 14cos2x = 0 The solution to this equation could not be determined.
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