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Suppose theta and phi(ne 0) are such tha...

Suppose `theta and phi(ne 0)` are such that sec `(theta+phi), sec theta and sec (theta-phi)` are in A.P. If `cos theta=kcos((phi)/(2))` for some k, then k is equal to

A

`pm 1`

B

`pm 2`

C

`pmsqrt2`

D

`pm (1)/(sqrt2)`

Text Solution

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The correct Answer is:
C
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