A. $\arctan x + \ln |x| + C$
B. $\frac { 1 } { 3 } x ^ { 3 } - x + \arctan x + C$
C. $\tan x - x + C$
D. $\frac { 1 } { 2 } ( x - \sin x ) + C$
[题目] int ((tan x+cot x))^2dx=
int dfrac (ln tan x)(cos xsin x)dx
(17) int dfrac (2cdot {3)^x-5cdot (2)^x}({3)^x}dx-|||-(18) (int )_(e)^exe(sex-ta
4】(1993，数三) int (tan x)/(sqrt(cos x))dx=____.4】(1993，数三) $\int \frac{\tan x}{\sq
int f(x), dx = xe^x + C，则 int f(2x), dx = ( )A. $2xe^{2x} + C$B. $2xe^x + C$C. $
int x(x+2)dx = ( )A. $\frac{1}{2} x^3 + x^2 + C$B. $\frac{1}{3} x^3 + 2x^2 + C$C
不定积分int dfrac (dx)(4{x)^2-9}=-|||-__.int dfrac (dx)(4{x)^2-9}=-|||-__int dfrac (
定积分(int )_(0)^1sqrt (2x-{x)^2}dx=( )(int )_(0)^1sqrt (2x-{x)^2}dx=( )(int )_(0
(3)若 int f(x)dx=(x)^2+C, 则 int xf(1-(x)^2)dx= __ ;
若 int f(x)dx = sin x + C，则 int xf(1-x^2)dx = ( )A. $2\sin(1-x^2)+ C$B. $-\frac{1