MCQ
`int_0^2 1/sqrt(4 - x^2)dx` = ______
- A`pi/3`
- B`pi/4`
- ✓`pi/2`
- Dπ
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$\begin{array}{cc}
\phantom{...........}\ce{O}\\
\phantom{...........}||\\
\ce{2A + (C6H5CH2)2 Cd -> 2CH3 - C - CH2 - C6H5 + CdCl2}\end{array}$