求下列曲线在指定点处的曲率及曲率半径: (1)椭圆2x2+y2=1在点(0,1)处; (2)抛物线y=x2-4x+3在顶点处; (3)悬链线y=acoshx/a(a>0),在点(x。,y。)处; (4)摆线在对应t=π/2的点处; (5)阿基米德螺线ρ=a

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问题 求下列曲线在指定点处的曲率及曲率半径:
(1)椭圆2x2+y2=1在点(0,1)处;
(2)抛物线y=x2-4x+3在顶点处;
(3)悬链线y=acoshx/a(a>0),在点(x。,y。)处;
(4)摆线在对应t=π/2的点处;
(5)阿基米德螺线ρ=aθ(a>0)在对应θ=π的点处.

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