[题目]讨论曲线 =4ln x+k 与 =4x+(ln )^4x 的交点个-|||-数.

已知 =ln (cos 4x)，则 =ln (cos 4x)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.

(5)伯努利方程 -y-3x(y)^4ln x=0 的解为 () .-|||-(A) ^-3-dfrac (3)(4)(x)^2(ln x+1)=0 (B) d

求定积分(int )_(0)^4ln (sqrt (x)+1)dx.求定积分.

(4)int_(1)^4(ln x)/(sqrt(x))dx;(4)$\int_{1}^{4}\frac{\ln x}{\sqrt{x}}dx;$

(4) (int )_(1)^4dfrac (ln x)(sqrt {x)}dx

14.求定积分 int_(0)^4ln(2+sqrt(x))dx14.求定积分 $\int_{0}^{4}\ln(2+\sqrt{x})dx$

求极限underset(lim)(x→0)(（1-cosx）[x-ln（1+tanx）])/(si(n)^4x)．求极限$\underset{lim}{x→0}

函数(x)=ln x的微分(x)=ln x(x)=ln x(x)=ln x(x)=ln x(x)=ln x函数的微分