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If x^2+y^2=R^2(w h e r eR >0)a n dk=(y^'...

If `x^2+y^2=R^2(w h e r eR >0)a n dk=(y^'')/((1+y'^2)^3)` then find `k` in terms of `R` alone.

A

`(1)/(R)`

B

`-(1)/(R)`

C

R

D

`(1)/(2R)`

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