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Simplifying cos(x) + -1cos(4x) = 0 Multiply cos * x cosx + -1cos(4x) = 0 Remove parenthesis around (4x) cosx + -1cos * 4x = 0 Reorder the terms for easier multiplication: cosx + -1 * 4cos * x = 0 Multiply -1 * 4 cosx + -4cos * x = 0 Multiply cos * x cosx + -4cosx = 0 Combine like terms: cosx + -4cosx = -3cosx -3cosx = 0 Solving -3cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '-3'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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