(7)cos x dx=sinx+C dx (8)2= cscr ax cotx+C sIn x dx secx dx= tanx+C cos (10)sec stan x dx=secx+C (11csc x cot x dx=-cscx+C (12) dx= arcsinx +C (13)∫ 14.2 dr=arctan+C. 前页后页结束前页 后页 结束 2 2 d (8) csc d cot . sin x x x x C x   = = − + (10) sec tan d sec .  x x x x C = + (7) cos d sin .  x x x C = + 2 2 d (9) sec d tan . cos x x x x C x   = = + (11) csc cot d csc .  x x x x C = − + 2 1 (12) d arcsin . 1 x x C x = + −  2 1 (13) d arctan . 1 x x C x = + + 