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If a x^2+2h x y+b y^2=1,t h e n(d^2y)/(d...

If `a x^2+2h x y+b y^2=1,t h e n(d^2y)/(dx^2)` is (a)`(h^2-a b)/((h x+b y)^2)` (b) `(a b-h^2)/((h x+b y)^2)` `(h^2+a b)/((h x+b y)^2)` (d) none of these

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