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