3.设 approx N(0,(4)^2), approx N(1,(3)^2), 且 (rho )_(x)=-dfrac (1)(2), 令 =dfrac (
3.设 =xarcsin dfrac (x)(2)+sqrt (4-{x)^2} 则 dy= __ 。
设 (x+dfrac (1)(x))=(x)^2+dfrac (1)({x)^2}, 则 lim _(xarrow 3)f(x)= __
设l为椭圆dfrac ({x)^2}(4)+dfrac ({y)^2}(3)=1,其周长记为a,则dfrac ({x)^2}(4)+dfrac ({y)^2}(
设函数=dfrac ({x)^2}(x-1),则=dfrac ({x)^2}(x-1)=________.设函数,则=________.
1.设 (dfrac (1)(x))=x((dfrac {x)(x+1))}^2, 则 f(x)= ()-|||-(A) dfrac (1)(x)((dfrac
3、设 (x,y)=arctan dfrac (x)(y), 则 (1,1)=-|||-(A)1; (B)0; (C) dfrac {1)(2),dfrac
设 (x+dfrac (1)(x))=dfrac ({x)^2}({x)^4+1}(xneq 0), 求f(x)。
3.若函数 f(x)= {(1-dfrac {x)(2))}^dfrac (1{x)} xlt 0 x+a xgeqslant 0
[题目]设 (x+dfrac (1)(x))=(x)^2+dfrac (1)({x)^2}, 则f(x)= __