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If tanx=b/a , then sqrt((a+b)/(a-b))+sqr...

If `tanx=b/a ,` then `sqrt((a+b)/(a-b))+sqrt((1-b)/(a+b))` is equal to `2s inx//sqrt(sin2x)` (b) `2cosx//sqrt(cos2x)` `2cosx//sqrt(sin2x)` (d) `2s inx//sqrt(cos2x)`

A

`2sin x//sqrt(2sin2x)`

B

`2cosx//sqrt(cos2x)`

C

`2cos x//sqrt(sin2x)`

D

`2sinx//sqrt(cos2x)`

Text Solution

Verified by Experts

The correct Answer is:
B

We have `sqrt(((a+b)/(a-b)))+sqrt(((a-b)/(a+b)))=(a+b+a-b)/(sqrt((a^(2)-b^(2))))`
`=(2a)/(sqrt((a^(2)-b^(2))))=(2)/(sqrt((1-(b//a)^(2))))`
`=(2)/(sqrt(1-tan^(2)x))=(2cosx)/(sqrt((cos^(2)x-sin^(2)x)))`
`=(2cosx)/(sqrt((cos2x)))`
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