If sectheta+tantheta=k, find the value o...

If `sectheta+tantheta=k,` find the value of `costheta`

A

`k/(k^2-1)`

B

`k/(k^2+1)`

C

`(2k)/(k^2+1)`

D

`(2k)/(k^2-1)`

लिखित उत्तर

Verified by Experts

The correct Answer is:

C

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