1.(单选题)当x→0时，x^2sin^2(1)/(x)是x的( ).

1.单选题(1)当x→0时，f(x)=sin ax^3与g(x)=x^2ln(1-x)是等价无穷小，则（）A. a=1B. a=2C. a=-1D. a=-2

27、下列函数中，偶函数是（ ）.A.=(x)^2sin x+1B.=(x)^2sin x+1C.=(x)^2sin x+1D.=(x)^2sin x

计算下列极限lim _(xarrow 0)(x)^2sin dfrac (1)(x)lim _(xarrow 0)(x)^2sin dfrac (1)(x)计算

lim _(xarrow 0)dfrac ({x)^2sin dfrac (1)(x)}(tan x)=A.0B.1C.lim _(xarrow 0)dfrac

当x→0时,变量 dfrac (1)({x)^2}sin dfrac (1)(x) 是-|||-__当x→0时,变量 dfrac (1)({x)^2}sin d

1.[单选题]已知f(x)=2x^2-3x+sin(pi)/(7)+ln2，则f^prime(x)=（）A. x-3B. 4xC. 4x+3D. 4x-3

下列函数中，是偶函数的是( )A.(x)=(x)^2sin xB.(x)=(x)^2sin xC.(x)=(x)^2sin xD.(x)=(x)^2sin

2【单选题】设f(x,y)=}(x^2+y^2)sin(1)/(sqrt(x^2)+y^(2)),(x,y)neq(0,0)0,(x,y)=(0,0)f(x,y

计算下列极限:-|||-(1) lim _(xarrow 0)(x)^2sin dfrac (1)(x);-|||-(2)lim arctan x

不定积分 int (dfrac (1)({x)^2}+2sin x+dfrac (1)(x))dx= ( )不定积分 ()A.B.C.D.