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Simplifying 4 + -2cos(a) + cos2(a) + -9cos(2a) = 0 Multiply cos * a 4 + -2acos + cos2(a) + -9cos(2a) = 0 Multiply cos2 * a 4 + -2acos + acos2 + -9cos(2a) = 0 Remove parenthesis around (2a) 4 + -2acos + acos2 + -9cos * 2a = 0 Reorder the terms for easier multiplication: 4 + -2acos + acos2 + -9 * 2cos * a = 0 Multiply -9 * 2 4 + -2acos + acos2 + -18cos * a = 0 Multiply cos * a 4 + -2acos + acos2 + -18acos = 0 Reorder the terms: 4 + -2acos + -18acos + acos2 = 0 Combine like terms: -2acos + -18acos = -20acos 4 + -20acos + acos2 = 0 Solving 4 + -20acos + acos2 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -20acos + -4 + acos2 = 0 + -4 Reorder the terms: 4 + -4 + -20acos + acos2 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -20acos + acos2 = 0 + -4 -20acos + acos2 = 0 + -4 Combine like terms: 0 + -4 = -4 -20acos + acos2 = -4 Reorder the terms: 4 + -20acos + acos2 = -4 + 4 Combine like terms: -4 + 4 = 0 4 + -20acos + acos2 = 0 The solution to this equation could not be determined.
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