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((sin 2A)/(sec A -1))((sec 2A)/(sec 2A+1...

`((sin 2A)/(sec A -1))((sec 2A)/(sec 2A+1))=`

A

`sin A//2 `

B

`cos A//2`

C

`tan A//2`

D

`cot A//2 `

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The correct Answer is:
D
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 C ( MULTIPLE AND SUBMULTIPLE ANGLES )
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