1.

If \[\tan \theta +\sin \theta =m\]and \[\tan \theta -\sin \theta =n,\]then [IIT 1970]

A. \[{{m}^{2}}-{{n}^{2}}=4mn\]
B. \[{{m}^{2}}+{{n}^{2}}=4mn\]
C. \[{{m}^{2}}-{{n}^{2}}={{m}^{2}}+{{n}^{2}}\]
D. \[{{m}^{2}}-{{n}^{2}}=4\sqrt{mn}\]
Answer» E.


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