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Simplifying 15cos(5x) + -15sin(5x) = 0 Remove parenthesis around (5x) 15cos * 5x + -15sin(5x) = 0 Reorder the terms for easier multiplication: 15 * 5cos * x + -15sin(5x) = 0 Multiply 15 * 5 75cos * x + -15sin(5x) = 0 Multiply cos * x 75cosx + -15sin(5x) = 0 Remove parenthesis around (5x) 75cosx + -15ins * 5x = 0 Reorder the terms for easier multiplication: 75cosx + -15 * 5ins * x = 0 Multiply -15 * 5 75cosx + -75ins * x = 0 Multiply ins * x 75cosx + -75insx = 0 Solving 75cosx + -75insx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '75insx' to each side of the equation. 75cosx + -75insx + 75insx = 0 + 75insx Combine like terms: -75insx + 75insx = 0 75cosx + 0 = 0 + 75insx 75cosx = 0 + 75insx Remove the zero: 75cosx = 75insx Divide each side by '75osx'. c = ino-1 Simplifying c = ino-1
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