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

The integrating factor of the differential equation \(\left( {{x^2} -

1.	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
A.	x2(x2 - 1)
B.	x2(x2 + 1)
C.	x(x2 - 1)
D.	x(x2 + 1)
Answer» B. x2(x2 + 1)