MCQ
${d \over {dx}}\log \tan \left( {{\pi \over 4} + {x \over 2}} \right) = $
- A$\text{cosec} \,x$
- B$ - \ \text{cosec} \,x$
- ✓$\sec x$
- D$ - \sec x$
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$\,P[B/(A \cup B)^c] = .....$