1.

\[\frac{d}{dx}(\log \tan x)=\]                                           [MNR 1986]

A.            \[2\sec 2x\]
B.            \[2\,\text{cosec }2x\]
C.            \[\sec 2x\]
D.            \[\text{cosec}\,2x\]
Answer» C.            \[\sec 2x\]


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