• 2022-06-05
    函数$z=\arcsin\dfrac{1}{~\sqrt{x+y}~}$的定义域为( )
    A: $\left\{(x,y)\left|~x+y\geq
    0\right.\right\}$;
    B: $\left\{(x,y)\left|~x+y\geq
    1~\text{或}~x+y\leq
    -1 \right.\right\}$;
    C: $\left\{(x,y)\left|~x+y\geq
    1\right.\right\}$;
    D: $\left\{(x,y)\left|~x+y\geq
    \dfrac{4}{~\pi^2~}\right.\right\}$.
  • 举一反三