• 2022-06-15
    双曲线\(xy = 1\) 在点\((1,1)\)处的曲率为 ( )
    A: \(\sqrt 2 \)
    B: \(2\sqrt 2 \)
    C: \( { { \sqrt 2 } \over 2}\)
    D: \(\sqrt 2-1 \)