\tan \left(\frac{\pi}{4}+A\right)+\tan \left(\frac{\pi}{4}-A\right)=C) – InterviewSolution

1.	\tan \left(\frac{\pi}{4}+A\right)+\tan \left(\frac{\pi}{4}-A\right)=C) 2tan 2 AD) 2 cos ec2 AA) 2sec 2AB) 2sec 2 A
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