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Simplifying 7cos(2x) = -7cos(x) Remove parenthesis around (2x) 7cos * 2x = -7cos(x) Reorder the terms for easier multiplication: 7 * 2cos * x = -7cos(x) Multiply 7 * 2 14cos * x = -7cos(x) Multiply cos * x 14cosx = -7cos(x) Multiply cos * x 14cosx = -7cosx Solving 14cosx = -7cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '7cosx' to each side of the equation. 14cosx + 7cosx = -7cosx + 7cosx Combine like terms: 14cosx + 7cosx = 21cosx 21cosx = -7cosx + 7cosx Combine like terms: -7cosx + 7cosx = 0 21cosx = 0 Divide each side by '21'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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