问题
填空题
双曲线y2-x2=1的焦点坐标为______.
答案
由题意,焦点在y轴上,且a=b=1,
∴c=
=a2+b2 2
∴焦点坐标为 (0,
)(0,-2
)2
故答案为(0,
),(0,-2
)2
双曲线y2-x2=1的焦点坐标为______.
由题意,焦点在y轴上,且a=b=1,
∴c=
=a2+b2 2
∴焦点坐标为 (0,
)(0,-2
)2
故答案为(0,
),(0,-2
)2