MCQ
$\int_{}^{} {\frac{{2x{{\tan }^{ - 1}}{x^2}}}{{1 + {x^4}}}} \;dx = $
- A${[{\tan ^{ - 1}}{x^2}]^2} + c$
- ✓$\frac{1}{2}{[{\tan ^{ - 1}}{x^2}]^2} + c$
- C$2{[{\tan ^{ - 1}}{x^2}]^2} + c$
- Dએકપણ નહિ.
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$R = \{ (A,B) \in M \times M$ : $AB = BA\} ,$ હોય તો $R$ એ...........