(4 例5 1+ d() 1+(-)2 g-+c 例6 例7 In 「nd(mx)=mmx 例8.∫f( cos x)sin xd=-f( cos x)dcos=-(cosx)+c 例9 与 sin x CoS x12 = 4 3 (4 3 ) 9 1 3 3 − − x d − x  = −  − x + c 2 3 3 (4 3 ) 3 2 9 1 = − − x + c 2 3 3 (4 3 ) 27 2 例 5．  + 2 2 a x dx =  + 2 2 1 ( ) 1 a x dx a =  + 2 1 ( ) ( ) 1 a x a x d a = c a x arctg a + 1 例 6．  − 2 2 a x dx =  − 2 1 ( ) 1 a x dx a =  − 2 1 ( ) ( ) a x a x d = c a x arcsin + 例 7．  x x dx ln =  (ln ) ln 1 d x x = ln ln x + c 例 8．  f (cos x)sin xdx =  − f (cos x)d cos x = − f (cos x) + c 例 9．  x dx sin 与  x dx cos