engineering recuitment GATE EE 2023-24 Test Series Engineering Mathematics Differential Equations First Order Equations
The integrating factor of the differential equation \(\left( {{x^2} - 1} \right)x\frac{{dy}}{{dx}} + 2\left( {2{x^2} - 1} \right)y = - 5{x^3}\) is
1
x2(x2 - 1)
2
x2(x2 + 1)
3
x(x2 - 1)
4
x(x2 + 1)