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If sec theta - tan theta =(a+1)/(a-1), t...

If `sec theta - tan theta =(a+1)/(a-1),` then `cos theta =`........... A) `(a^(2) +1)/(a ^(2)-1)` B) `(a^(2) -1)/(a ^(2)+1)` C) `(2a)/(a ^(2)+1)` D) `(2a)/(a ^(2)-1)`

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
B
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