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If (d^(2)x)/(dy^(2)) ((dy)/(dx))^(3) + (...

If `(d^(2)x)/(dy^(2)) ((dy)/(dx))^(3) + (d^(2) y)/(dx^(2)) = k ` , then k is equal to

A

`(dy)/(dx)`

B

`y^(2) (dy)/(dx)`

C

`y(dy)/(dx)+((d^(2)x)/(dy^(2)))^(2)`

D

None of these

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