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Simplifying cos(7x) + cos(x) + -4cos(4x) = 0 Remove parenthesis around (7x) cos * 7x + cos(x) + -4cos(4x) = 0 Reorder the terms for easier multiplication: 7cos * x + cos(x) + -4cos(4x) = 0 Multiply cos * x 7cosx + cos(x) + -4cos(4x) = 0 Multiply cos * x 7cosx + cosx + -4cos(4x) = 0 Remove parenthesis around (4x) 7cosx + cosx + -4cos * 4x = 0 Reorder the terms for easier multiplication: 7cosx + cosx + -4 * 4cos * x = 0 Multiply -4 * 4 7cosx + cosx + -16cos * x = 0 Multiply cos * x 7cosx + cosx + -16cosx = 0 Combine like terms: 7cosx + cosx = 8cosx 8cosx + -16cosx = 0 Combine like terms: 8cosx + -16cosx = -8cosx -8cosx = 0 Solving -8cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '-8'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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