Question: How to integrate

Hello my friends
Please help me solve the integration problem in the attached Maple code below (why was the integration not done in u[4]?) ... Thank you very much

``

u[1] :=  1/3*t^3*x + 2*t*x + (-1)*0.7522527780*t^(3/2)*x + (-1)*0.1719434922*t^(7/2)*x + (-1)*0.01587301587*t^7*x + (-1)*0.1333333333*t^5*x

(1/3)*t^3*x+2*t*x-.7522527780*t^(3/2)*x-.1719434922*t^(7/2)*x-0.1587301587e-1*t^7*x-.1333333333*t^5*x

(1)

u[2] := subs(t=Tau,u[1]);

(1/3)*Tau^3*x+2*Tau*x-.7522527780*Tau^(3/2)*x-.1719434922*Tau^(7/2)*x-0.1587301587e-1*Tau^7*x-.1333333333*Tau^5*x

(2)

u[3]:= int(u[2],Tau = 0 .. t);

t^2*x+0.8333333333e-1*t^4*x-0.2222222222e-1*t^6*x-0.1984126984e-2*t^8*x-.3009011112*t^(5/2)*x-0.3820966493e-1*x*t^(9/2)

(3)

u[4]:= int((t-Tau)^(-0.5)*u[2],Tau = 0 .. t);

int(((1/3)*Tau^3*x+2*Tau*x-.7522527780*Tau^(3/2)*x-.1719434922*Tau^(7/2)*x-0.1587301587e-1*Tau^7*x-.1333333333*Tau^5*x)/(t-Tau)^.5, Tau = 0 .. t)

(4)

``

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