6.极限 lim _(xarrow infty )(x+3)sin dfrac (4)(x) 的值是-|||-A.3 B.4 C.12

4、 lim _(xarrow infty )dfrac (sin x)(x)= __ ;

3.求下列极限:-|||-(1) lim _(xarrow 2)dfrac ({x)^2-3x-4}({x)^2-4} =-|||-(3) lim _(xarr

3.求下列极限:-|||-(1) lim _(xarrow 2)dfrac ({x)^2-3x-4}({x)^2-4} :-|||-(3) lim _(xarr

求lim _(xarrow infty )dfrac (sin dfrac {3)(x)}(sin dfrac {2)(x)}求

求极限lim _(xarrow 0)dfrac ({x)^3+(x)^4}(x-sin x)-|||-__求极限

12.求下列函数的极限.-|||-(7) lim _(xarrow infty )((dfrac {x+3)(x-1))}^x+1;

lim _(xarrow infty )xcdot sin dfrac (3)(x)=

4.求下列极限:-|||-(1) lim _(xarrow infty )(e)^dfrac (1{x)} :-|||-x→∞-|||-(3) lim _(xa

17、单选 lim _(xarrow infty )dfrac (sin 3x+2x)(sin 2x-3x)-|||-A dfrac (1)(3)-|||-B

lim _(xarrow 0)dfrac (sin x)({x)^3+4x}