# How to prove $\int^{\infty}_{0}\frac{\sin x}{x}\mathrm{d}x=\frac{\pi}{2}$ [duplicate]

How to prove $$\int^{\infty}_{0}\frac{\sin x}{x}\mathrm{d}x=\frac{\pi}{2}$$ Do you have a simple method ?

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## marked as duplicate by Marvis, Ｊ. Ｍ., David Mitra, AD., mixedmath♦Apr 29 '12 at 5:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Duplicate: math.stackexchange.com/q/5248/23784 –  user23784 Apr 29 '12 at 4:48

## 1 Answer

This is known as the Dirichlet integral. A couple of different derivations appear on the Wikipedia page:

http://en.wikipedia.org/wiki/Dirichlet_integral#Evaluation

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