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Evaluate

$\int_{0}^{\infty} \frac{ \sin^4 x } { x^4 } \, \mathrm dx.$

Details and assumptions

You may use the fact that $\displaystyle \int_0 ^{\infty} \frac{ \sin^2 x } { x^2 } \ \mathrm dx = \frac{ \pi}{2}$.

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