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Simplifying -1cosx + 4cos * 2x = 0 Reorder the terms for easier multiplication: -1cosx + 4 * 2cos * x = 0 Multiply 4 * 2 -1cosx + 8cos * x = 0 Multiply cos * x -1cosx + 8cosx = 0 Combine like terms: -1cosx + 8cosx = 7cosx 7cosx = 0 Solving 7cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '7'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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