71, 72. Integration of (sinx)" (cosx)" dx 73. Integration of (tanx)" dx and of (cotx)" dx 74. Integration of x" sin x dx, and of x" cos x dx 75, 76. Integration of eax (cosx)" dx, and of eax (sin x)" dx 77. Integration of f(x) sin ̄1xdx, f(x) tan-1x dx, &c.