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Simplifying cos(2x) + -3cos(x) + 4 = 0 Remove parenthesis around (2x) cos * 2x + -3cos(x) + 4 = 0 Reorder the terms for easier multiplication: 2cos * x + -3cos(x) + 4 = 0 Multiply cos * x 2cosx + -3cos(x) + 4 = 0 Multiply cos * x 2cosx + -3cosx + 4 = 0 Reorder the terms: 4 + 2cosx + -3cosx = 0 Combine like terms: 2cosx + -3cosx = -1cosx 4 + -1cosx = 0 Solving 4 + -1cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1cosx = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1cosx = 0 + -4 -1cosx = 0 + -4 Combine like terms: 0 + -4 = -4 -1cosx = -4 Divide each side by '-1osx'. c = 4o-1s-1x-1 Simplifying c = 4o-1s-1x-1
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