∫_(-[infinity])^[infinity]▒〖e^(-x^2 ) dx〗=[∫_(-[infinity])^[infinity]▒〖e^(-x^2 ) dx〗 ∫_(-[infinity])^[infinity]▒〖e^(-y^2 ) dy〗]^(1\/2)=[∫_0^2π▒∫_0^[infinity]▒〖e^(-r^2 ) rⅆrⅆθ〗]^(1\/2)=[π∫_0^[infinity]▒〖e^(-u) du〗]^(1\/2)=√π
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what is this , I can't understand
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what is the question
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in which class you are
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