MHB How can I integral this problem?

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\[ \int dx_1dx_2...dx_d e^{(x^2_1+x^2_2+...+x^2_d)^{r/2}} = \frac{\pi ^{d/2}(d/r)!}{(d/2)!} \]

How can I derive this answer?
 
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"Integral" is a noun. The verb is "integrate".
 
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