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Simplifying cos(a) + cos(2a) = 0 Multiply cos * a acos + cos(2a) = 0 Remove parenthesis around (2a) acos + cos * 2a = 0 Reorder the terms for easier multiplication: acos + 2cos * a = 0 Multiply cos * a acos + 2acos = 0 Combine like terms: acos + 2acos = 3acos 3acos = 0 Solving 3acos = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '3'. acos = 0 Simplifying acos = 0 The solution to this equation could not be determined.
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