函数z=arcsin[(x2+y2)/4]+ln(x2+y2)的定义域是()
A.{(x,y)∣0≤x2+y2≤4}
B.{(x,y)∣0≤x2+y2﹤4}
C.{(x,y)∣0﹤x2+y2≤4}
D.{(x,y)∣0﹤x2+y2﹤4}
正确答案C
函数z=arcsin[(x2+y2)/4]+ln(x2+y2)的定义域是()
A.{(x,y)∣0≤x2+y2≤4}
B.{(x,y)∣0≤x2+y2﹤4}
C.{(x,y)∣0﹤x2+y2≤4}
D.{(x,y)∣0﹤x2+y2﹤4}
正确答案C