If tan alpjha=2, then he value ("co s...

If `tan alpjha=2`, then he value
`("co s ec"^(2) alpha-sec^(2) alpha)/("co s ec"^(2)alpha+sec^(2) alpha)is `

A

`-(15)/(9)`

B

`-(3)/(5)`

C

`(3)/(5)`

D

`(17)/(5)`

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

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