calculus - Convergence of the integral $int_0^infty frac{sin^2x}{x^2}~mathrm dx.$

Determine whether the integral

$$\int_0^\infty \frac{\sin^2x}{x^2}~\mathrm dx$$ converges.

I know it converges, since in general we can use complex analysis, but I'd like to know if there is a simpler method that doesn't involve complex numbers. But I cannot come up with a function that I could compare the integral with.

Answer

Hint:$$x>1\implies0\le\frac{\sin^2(x)}{x^2}\le\frac1{x^2}\\0