$$\int_0^\infty(\sin(x)/x)^3 dx$$ Help me!
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You're missing a $dx$. Have you tried using a contour and the residue theorem? – Michael Burr May 29 '19 at 10:03
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Also, see show that $\int_{0}^{\infty} \frac {\sin^3(x)}{x^3}dx=\frac{3\pi}{8}$ – YuiTo Cheng May 29 '19 at 10:11