Make the u-substitution 2u 1- u? dx = 1+ u2 sin x = Cos x = and du 1+ u? to convert the integrand to a rational function of u, and then evaluate the integral. If you have a CAS, use it to evaluate the 1+ u2' integral (no substitution), and then confirm that the results are equivalent. 1 d.x 3 cos x %3D 4 sin x -

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