Question
$\int_{}^{} {\frac{{dx}}{{1 + x + {x^2} + {x^3}}} = } $
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$f(x)+\int_0^x(x-t) f^{\prime}(t) d t=\left(e^{2 x}+e^{-2 x}\right) \cos 2 x+\frac{2}{a} x,$ है, तो $(2 a +1)^5 a ^2$ बराबर है $...............$