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Simplifying cos(2A) = 2cos2(A) + -1 Remove parenthesis around (2A) cos * 2A = 2cos2(A) + -1 Reorder the terms for easier multiplication: 2cos * A = 2cos2(A) + -1 Multiply cos * A 2cosA = 2cos2(A) + -1 Multiply cos2 * A 2cosA = 2cos2A + -1 Reorder the terms: 2cosA = -1 + 2cos2A Solving 2cosA = -1 + 2cos2A Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2cos2A' to each side of the equation. 2cosA + -2cos2A = -1 + 2cos2A + -2cos2A Combine like terms: 2cos2A + -2cos2A = 0 2cosA + -2cos2A = -1 + 0 2cosA + -2cos2A = -1 Reorder the terms: 1 + 2cosA + -2cos2A = -1 + 1 Combine like terms: -1 + 1 = 0 1 + 2cosA + -2cos2A = 0 The solution to this equation could not be determined.
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