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)int dfrac (1)({cos )^2x(sin )^2x}dx.
()-|||-A) |(int )_(a)^bf(x)dx|geqslant (int )_(a)^b|f(x)|dx-|||-B |(int )_(a)^bf
设函数f(x)在[a,b]上可积,则(int )_(a)^bf(x)dx=A.(int )_(a)^bf(x)dx=B.(int )_(a)^bf(x)dx=C
求不定积分int dfrac (1)(2x)sqrt (ln x)dx=（）.int dfrac (1)(2x)sqrt (ln x)dx=int dfrac
int (2x^2)/(x^2 + 1) dx = ( )A. $2x - 2\arctan x + C$B. $x^2 - 2\arctan x + C$C.
int f(x), dx = xe^x + C，则 int f(2x), dx = ( )A. $2xe^{2x} + C$B. $2xe^x + C$C. $
(int )_(-1)^2x|x|dx=(int )_(-1)^1x|x|x+(int )_(1)^2x|x|x|=0+(int )_(1)^2(x)^2dx
int dfrac (1)(x{ln )^2x}dx
表达式 (int f(2x)dx)=f(2x)dx-|||-A)对-|||-B 错
(int )_(1)^2dfrac (dx)(x(1+sqrt {2x))}=( )A.(int )_(1)^2dfrac (dx)(x(1+sqrt {2x