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If sec(theta+alpha)+sec(theta-alpha)=2\ ...

If `sec(theta+alpha)+sec(theta-alpha)=2\ s e ctheta,` prove that `costheta=+-sqrt(2)cosalpha/2dot`

A

`pmsqrt2sin""(alpha)/(2)`

B

`pmsqrt2tan""(alpha)/(2)`

C

`pmsqrt2cos""(alpha)/(2)`

D

`pmsqrt2sec""(alpha)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
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