If secA + tanA =a, then the value of cos...

If secA + tanA =a, then the value of cosA is
यदि secA + tanA =a हो, तो cosA का मान क्या होगा?

A

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

B

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

C

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

D

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

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The correct Answer is:

B

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