Question: Unable to compute integral

I am unable to compute integral, it displays the function itself.

burrpdf := alpha*k*((x-gamma)/beta)^(alpha-1)/beta(1+((x-gamma)/beta)^alpha)^(k+1)

 

mean_burr_temp := simplify(x*burrpdf)

 

int(mean_burr_temp, x = gamma .. t)

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