64. If f is continuous on (0, 7), use the substitution u = = - x to show that S*xf(sin x) dx = I." f(sin x) dx 2 65. If
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64. If f is continuous on (0, 7), use the substitution u = = - x to show that S*xf(sin x) dx = I." f(sin x) dx 2 65. If
64. If f is continuous on (0, 7), use the substitution u = = - x to show that S*xf(sin x) dx = I." f(sin x) dx 2 65. If f is continuous, prove that w2 * L" s(cos x) dx = (*"? f\sin x) dx 66. Use Exercise 65 to evaluate S2 cos’x dx and 52 sin’x dx.
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