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Simplifying cos(3x) + -3xsin(3x) = 0 Remove parenthesis around (3x) cos * 3x + -3xsin(3x) = 0 Reorder the terms for easier multiplication: 3cos * x + -3xsin(3x) = 0 Multiply cos * x 3cosx + -3xsin(3x) = 0 Remove parenthesis around (3x) 3cosx + -3insx * 3x = 0 Reorder the terms for easier multiplication: 3cosx + -3 * 3insx * x = 0 Multiply -3 * 3 3cosx + -9insx * x = 0 Multiply insx * x 3cosx + -9insx2 = 0 Solving 3cosx + -9insx2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '9insx2' to each side of the equation. 3cosx + -9insx2 + 9insx2 = 0 + 9insx2 Combine like terms: -9insx2 + 9insx2 = 0 3cosx + 0 = 0 + 9insx2 3cosx = 0 + 9insx2 Remove the zero: 3cosx = 9insx2 Divide each side by '3osx'. c = 3ino-1x Simplifying c = 3ino-1x
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