已知
,则 
已知
,则 
设 int f(x) dx = (3)/(4) ln sin 4x + C,则 f(x) = ( )A. $3 \cos 4x$B. $- \cot 4x$C.
设 int f(x) , dx = (3)/(4) ln sin 4x + C,则 f(x) = (A. $3 \cos 4x$B. $3 \cot 4x$C.
(15)(int )_(0)^pi xsqrt ({cos )^2x-(cos )^4x}dx= __
[题目]讨论曲线 =4ln x+k 与 =4x+(ln )^4x 的交点个-|||-数.
int cos (ln x)dx..
求极限underset(lim)(x→0)((1-cosx)[x-ln(1+tanx)])/(si(n)^4x).求极限$\underset{lim}{x→0}
已知函数=ln [ ln (ln x)] ,则=ln [ ln (ln x)] _____.=ln [ ln (ln x)] =ln [ ln (ln x)]
[题目] int cos (ln x)dx.
int dfrac (ln tan x)(cos xsin x)dx
计算函数 =3(e)^x+2ln x+cos x的二阶导数( ) A =3(e)^x+2ln x+cos xB 3 ex + 2 x + x C =3(e)^