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If x^2/a^2-y^2/a^2=1, dy/dx can be expre...

If `x^2/a^2-y^2/a^2=1, dy/dx` can be expressed as (i)`x/y` (ii)`x/sqrt(x^2-a^2)` (iii)`1/sqrt((x/a)^2-1)` (iv) none of these

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