MCQ
$\int_\alpha^\beta \varphi(x) d x+\int_\beta^\alpha \varphi(x) d x=$
- A1
- B$2 \int_\alpha^\beta \varphi(x) d x$
- C$-2 \int_\beta^\alpha \varphi(x) d x$
- ✓$0$
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