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Simplifying 0 = -4(cos(2x)) + -1cos(x) Remove parenthesis around (2x) 0 = -4(cos * 2x) + -1cos(x) Reorder the terms for easier multiplication: 0 = -4(2cos * x) + -1cos(x) Multiply cos * x 0 = -4(2cosx) + -1cos(x) Remove parenthesis around (2cosx) 0 = -4 * 2cosx + -1cos(x) Multiply -4 * 2 0 = -8cosx + -1cos(x) Multiply cos * x 0 = -8cosx + -1cosx Combine like terms: -8cosx + -1cosx = -9cosx 0 = -9cosx Solving 0 = -9cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '9cosx' to each side of the equation. 0 + 9cosx = -9cosx + 9cosx Remove the zero: 9cosx = -9cosx + 9cosx Combine like terms: -9cosx + 9cosx = 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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