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### how to calculate the integral of $\sin^2(x)/x^2$ [duplicate]

Possible Duplicate: Proof for an integral involving sinc function How do I show that $\int_{-\infty}^\infty \frac{ \sin x \sin nx}{x^2} \ dx = \pi$? $\int_{-\infty}^{\infty}\sin^2(x)/x^2=\pi$ ...
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### Integral of Sinc Function Squared Over The Real Line [duplicate]

I am trying to evaluate $$\int_{-\infty}^{\infty} \frac{\sin(x)^2}{x^2} dx$$ Would a contour work? I have tried using a contour but had no success. Thanks. Edit: About 5 minutes after posting this ...
### Improper integral of $\sin t/t$ [duplicate]
Possible Duplicate: Proof for an integral involving sinc function Prove that: $\displaystyle \int_{0}^{\infty }\frac{\sin t}{t}dt=\int_{0}^{\infty }\frac{\sin^{2}t}{t^{2}}dt$ Thank you in ...