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If cos(theta-phi), cos(theta), cos(theta...

If `cos(theta-phi)`, `cos(theta)`, `cos(theta+phi)` are in HP, the the value of `cos(theta)sec(phi/2)` is

A

2

B

`sqrt2`

C

`-sqrt2`

D

None of these

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The correct Answer is:
B, C
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