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Simplifying cos(5x) + cos(9x) + -1cos(4x) = 1 Remove parenthesis around (5x) cos * 5x + cos(9x) + -1cos(4x) = 1 Reorder the terms for easier multiplication: 5cos * x + cos(9x) + -1cos(4x) = 1 Multiply cos * x 5cosx + cos(9x) + -1cos(4x) = 1 Remove parenthesis around (9x) 5cosx + cos * 9x + -1cos(4x) = 1 Reorder the terms for easier multiplication: 5cosx + 9cos * x + -1cos(4x) = 1 Multiply cos * x 5cosx + 9cosx + -1cos(4x) = 1 Remove parenthesis around (4x) 5cosx + 9cosx + -1cos * 4x = 1 Reorder the terms for easier multiplication: 5cosx + 9cosx + -1 * 4cos * x = 1 Multiply -1 * 4 5cosx + 9cosx + -4cos * x = 1 Multiply cos * x 5cosx + 9cosx + -4cosx = 1 Combine like terms: 5cosx + 9cosx = 14cosx 14cosx + -4cosx = 1 Combine like terms: 14cosx + -4cosx = 10cosx 10cosx = 1 Solving 10cosx = 1 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Divide each side by '10osx'. c = 0.1o-1s-1x-1 Simplifying c = 0.1o-1s-1x-1
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