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Simplifying cos(5x) = -1cos(4x) Remove parenthesis around (5x) cos * 5x = -1cos(4x) Reorder the terms for easier multiplication: 5cos * x = -1cos(4x) Multiply cos * x 5cosx = -1cos(4x) Remove parenthesis around (4x) 5cosx = -1cos * 4x Reorder the terms for easier multiplication: 5cosx = -1 * 4cos * x Multiply -1 * 4 5cosx = -4cos * x Multiply cos * x 5cosx = -4cosx Solving 5cosx = -4cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4cosx' to each side of the equation. 5cosx + 4cosx = -4cosx + 4cosx Combine like terms: 5cosx + 4cosx = 9cosx 9cosx = -4cosx + 4cosx Combine like terms: -4cosx + 4cosx = 0 9cosx = 0 Divide each side by '9'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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