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对于椭圆 x^2/a^2 + y^2/b^2 = 1 ,隐式计算 y'' 并使用椭圆方程简化。(Resp: .)
对于椭圆 x^2/a^2 + y^2/b^2 = 1 ,隐式计算 y'' 并使用椭圆方程简化。(Resp: .)
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