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let f(x)=cxe -x^2 if x is greater than or equal to 0 and f(x)=0 if x <0. for what value of c is f(x) a

let f(x)=cxe^{-x^2}if x is greater than or equal to 0 and f(x)=0 if x<0. for what value of c is f(x) a probability density function.

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