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Simplifying cos(4x) + -1cos(x) = 0 Remove parenthesis around (4x) cos * 4x + -1cos(x) = 0 Reorder the terms for easier multiplication: 4cos * x + -1cos(x) = 0 Multiply cos * x 4cosx + -1cos(x) = 0 Multiply cos * x 4cosx + -1cosx = 0 Combine like terms: 4cosx + -1cosx = 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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