If $2\sec 2\alpha = \tan \beta + \cot \beta ,$ then one of the values of $\alpha + \beta $ is
If $2\sec 2\alpha = \tan \beta + \cot \beta ,$ then one of the values of $\alpha + \beta $ is
- A
$\frac{\pi }{4}$
- B
$\frac{\pi }{2}$
- C
$\pi $
- D
$2\pi $
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- [IIT 1993]
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