=ln (1+(e)^2x)+ln 2

(19) =ln ((e)^x+sqrt (1+{e)^2x}).

(2) lim _(xarrow 0)[ dfrac (1)(ln (1+{tan )^2x)}-dfrac (1)(ln (1+{x)^2)}]

(2) lim _(xarrow 0)[ dfrac (1)(ln (1+{tan )^2x)}-dfrac (1)(ln (1+{x)^2)}]

设=ln (x)^2+ln 2x，则=ln (x)^2+ln 2x（ ）=ln (x)^2+ln 2x=ln (x)^2+ln 2x=ln (x)

求极限 lim _(xarrow 0)dfrac (ln (1+{x)^2)-ln (1+(sin )^2x)}(x{sin )^3x}

设 =ln (1+(sin )^2x), 求dy.

lim _(xarrow 0)dfrac (ln ({sin )^2x+(e)^x)-x}(ln ({x)^2+(e)^2x)-2x}

15 lim_(x to +infty) ln(1+2^x) ln(1+(2)/(x))=____.15 $\lim_{x \to +\infty} \ln(1

[题目]设 (x)=sqrt (1+{ln )^2x} 则 (e)=()-|||-A、 dfrac (sqrt {2)}(4)-|||-B、 dfrac (sq

求不定积分int dfrac (1)(2x)sqrt (ln x)dx=（）.int dfrac (1)(2x)sqrt (ln x)dx=int dfrac