state gov RPSC 2nd Grade Senior Teacher Mock Test Series 2025 Engineering Mathematics Calculus Definite Integrals
समाकल\(\mathop \smallint \limits_{ - \infty }^\infty \frac{{dx}}{{1 + {x^2}}}\) का मान है:
1
-π
2
\( - \frac{\pi }{2}\)
3
π/2
4
π
5
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