1.
The function y=f(x)y = f(x) is the solution of dydx+xyx21=x4+2x1x2\frac{dy}{dx} + \frac{xy}{x^2-1} = \frac{x^4+2x}{\sqrt{1-x^2}} in (1,1)(-1,1) satisfying f(0)=0f(0)=0. Then 3/23/2f(x)dx\int_{-\sqrt{3}/2}^{\sqrt{3}/2} f(x)\,dx is