Find the integrating factor μ(x)\mu(x)μ(x) for (1+x2)y′+2xy=1(1+x^2)y' + 2xy = 1(1+x2)y′+2xy=1.
1+x21+x^21+x2
x2x^2x2
exe^xex
arctan(x)\arctan(x)arctan(x)