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If y=tan^-1x find (d^2y)/(dx^2) in term...

If `y=tan^-1x` find `(d^2y)/(dx^2)` in terms of y alone.

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`y=tan^(−1)x `
`x=tany`
Differentiating w.r.t.y, we get
`(dx)/(dy)​=sec^2y`
...
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