MCQ
જો $y = {\log _{\sin x}}(\tan x),$ તો ${\left( {{{dy} \over {dx}}} \right)_{\pi /4}} = $
- A${4 \over {\log 2}}$
- B$ - 4\log 2$
- ✓${{ - 4} \over {\log 2}}$
- Dએક પણ નહીં
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