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Simplifying 2cos(2x) + 5cos(x) + 2 = 0 Remove parenthesis around (2x) 2cos * 2x + 5cos(x) + 2 = 0 Reorder the terms for easier multiplication: 2 * 2cos * x + 5cos(x) + 2 = 0 Multiply 2 * 2 4cos * x + 5cos(x) + 2 = 0 Multiply cos * x 4cosx + 5cos(x) + 2 = 0 Multiply cos * x 4cosx + 5cosx + 2 = 0 Reorder the terms: 2 + 4cosx + 5cosx = 0 Combine like terms: 4cosx + 5cosx = 9cosx 2 + 9cosx = 0 Solving 2 + 9cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 9cosx = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 9cosx = 0 + -2 9cosx = 0 + -2 Combine like terms: 0 + -2 = -2 9cosx = -2 Divide each side by '9osx'. c = -0.2222222222o-1s-1x-1 Simplifying c = -0.2222222222o-1s-1x-1
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