单项选择题
已知由方程siny+xey=0,确定y是x的函数,则dy/dx的值是:()
A.-(ey+cosy)/xey B.-ey/cosy C.-ey/(cosy+xey) D.-cosy/xey
设参数方程,确定了y是x的函数,f″(t)存在且不为零,则d2y/d2x的值是:()A.-1/f″(t)B.1...
设参数方程,确定了y是x的函数,f″(t)存在且不为零,则d2y/d2x的值是:()
A.-1/f″(t) B.1/[f″(t)]2 C.-1/[f″(t)]2 D.1/f″(t)
(x+ex)的值是:()A.eB.eC.1D.2
(x+ex)的值是:()
A.e B.e C.1 D.2
设参数方程,确定了y是x的函数,且f′(t)存在,f(0)=2,f′(0)=2,则当t=0时,dy/dx的值等...
设参数方程,确定了y是x的函数,且f′(t)存在,f(0)=2,f′(0)=2,则当t=0时,dy/dx的值等于:()
A.4/3 B.-4/3 C.-2 D.2