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Simplifying 7cos(x) = 7cos(2x) Multiply cos * x 7cosx = 7cos(2x) Remove parenthesis around (2x) 7cosx = 7cos * 2x Reorder the terms for easier multiplication: 7cosx = 7 * 2cos * x Multiply 7 * 2 7cosx = 14cos * x Multiply cos * x 7cosx = 14cosx Solving 7cosx = 14cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-14cosx' to each side of the equation. 7cosx + -14cosx = 14cosx + -14cosx Combine like terms: 7cosx + -14cosx = -7cosx -7cosx = 14cosx + -14cosx Combine like terms: 14cosx + -14cosx = 0 -7cosx = 0 Divide each side by '-7'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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