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Simplifying 2cos(x2) + -4x2sin(x2) = 0 Multiply cos * x2 2cosx2 + -4x2sin(x2) = 0 Multiply insx2 * x2 2cosx2 + -4insx4 = 0 Solving 2cosx2 + -4insx4 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4insx4' to each side of the equation. 2cosx2 + -4insx4 + 4insx4 = 0 + 4insx4 Combine like terms: -4insx4 + 4insx4 = 0 2cosx2 + 0 = 0 + 4insx4 2cosx2 = 0 + 4insx4 Remove the zero: 2cosx2 = 4insx4 Divide each side by '2osx2'. c = 2ino-1x2 Simplifying c = 2ino-1x2
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