1.

If tanalpha = p/qwhere alpha = 2beta, alpha being an acute angle then 1/(2)[p"cosec"2beta sec2beta] is equal to

Answer»

`SQRT(p^2+q^2)`
`sqrt(p^2-q^2)`
`sqrt(2p^2+q^2)`
`2sqrt(p^2+q^2)`

ANSWER :A


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