设 int f(x) , dx = (3)/(4) ln sin 4x + C，则 f(x) = (

设 int f(x) dx = (3)/(4) ln sin 4x + C，则 f(x) = ( )A. $3 \cos 4x$B. $- \cot 4x$C.

设 (x)=(e)^-x, 则 int dfrac (f(ln x))(x)dx= .(x)=(e)^-x, 则 int dfrac (f(ln x))(x)

若int f(x)dx=sin x+C,则f(x)=_____若$\int f(x)dx=\sin x+C$,则f'(x)=_____

设int_(-1)^13f(x)dx=18，int_(-1)^3f(x)dx=4，int_(-1)^3g(x)dx=3。则int_(-1)^3(1)/(5)[4

[题目]-|||-若 int f(x)dx=F(x)+C, 则 int f(2x-3)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

设|f(x)dx=F(x)+C,则|f(x)dx=F(x)+C|f(x)dx=F(x)+C|f(x)dx=F(x)+C|f(x)dx=F(x)+C|f(x)dx

已知 f(x)在 [1, 4] 可导, f(4)= 1, int_(0)^4 xf(x), dx = 3，则 int_(0)^4 f(x), dx = (

int f(x), dx = xe^x + C，则 int f(2x), dx = ( )A. $2xe^{2x} + C$B. $2xe^x + C$C. $

设 f(2)=4 , (int )_(0)^2f(x)dx=1, 则 (int )_(0)^2xf(x)dx=