第1912题:计算曲率中心
请查阅曲率中心的计算公式并计算 y=sinxy=\sin xy=sinx 在点 (π2,1)(\dfrac{\pi}{2},1) (2π,1) 处的曲率中心坐标.
A. (π2,13)(\dfrac{\pi}{2},\dfrac{1}{3}) (2π,31)
B. (π2,12) (\dfrac{\pi}{2},\dfrac{1}{2})(2π,21)
C. (π2,0)(\dfrac{\pi}{2},0)(2π,0)
D. (π2,−12)(\dfrac{\pi}{2},-\dfrac{1}{2})(2π,−21)