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If sec ( theta + alpha ) , sec theta , s...

If `sec ( theta + alpha ) , sec theta , sec (theta - alpha ) ` are in A.P. Then ` cos theta sec alpha //2= `

A

`-sqrt(2)`

B

`sqrt(2) `

C

`pmsqrt(2) `

D

`1`

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The correct Answer is:
C
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