常见类型 n+1 2 f∫(x) 3. f(Inx) 2 5.f(sin x)cos xd; 6.f(a )a dc 7. f(tan x)sec xdr; 8.J(arctan x) 1+x2常见类型: 1. ( ) ; 1 f x x dx n+ n ; ( ) 2. dx x f x ; (ln ) 3. dx x f x ; ) 1 ( 4. 2 dx x x f 5. f (sin x)cos xdx; 6. f (a )a dx; x x 7. (tan )sec ; 2 f x xdx ; 1 (arctan ) 8. 2 dx x f x +