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syms s t;
f = ((1-s)^(1/2)-(1-s)^(3/2))*(s-t)^(1/2)*t^(3/2);
int(int(f,t,0,s),s,0,1)

ans =

-(16*pi)/3465
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f =quad2d(@(s,t)((1-s).^(1/2)-(1-s).^(3/2)).*(s-t).^(1/2).*t.^(3/2),0,1,0,@(s)s)

f =

    0.0145
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