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If A,B and C are the angles of a triangl...

If A,B and C are the angles of a triangle such that sec(A-B), sec (A) and sec (A+B) are in arithmetic progression , then

A

`cosec^2A=2 cosec^2 B/2`

B

`2 sec^2 A = sec^2 B/2`

C

`2 cosec^2A=cosec^2 B/2`

D

`2 sec^2 B= sec^2 A/2`

Text Solution

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The correct Answer is:
B
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