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RMS of (a*sin([tex]\omega[/tex]*r) = a / [tex]\sqrt{}2[/tex]

Let a = 1/[tex]\omega[/tex]

Thus

RMS of ((1/[tex]\omega[/tex])*sin([tex]\omega[/tex]*r)) = 1 / ([tex]\omega[/tex]*[tex]\sqrt{}2[/tex])

But for sinc([tex]\omega[/tex]*x), what is formula for the RMS?