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