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The RMS f(x)=x^3 ~ in ~ (-\pi\leq x\leq \pi)~ is
\frac{\pi^6}{ \sqrt[]{7} }
\frac{\pi^7}{ \sqrt[]{7} }
\frac{\pi^3}{ \sqrt[]{14} }
\frac{\pi^3}{ \sqrt[]{7} }
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