matlab 积分求不出来，高手来帮我看看

syms x t u TA = 100; Cp = 100; p = 100; Ch = 5; Ic = 0.15; Ie = 0.1;M = 0.2; N = 0.1;fu = 1000+100*u+20*u^2;ft = 1000+100*t+20*t^2;theta = 0.08*1.5*x^(0.5);gt=int(theta,0,t);gu=int(theta,0,u);eg = exp(-gt);I1 = int((exp(gt)-1)*ft,0,T);I2 = int(exp(-gt)*int(exp(gu)*fu,t,T),t, 0, T);I3 = int(exp(-gt)*int(exp(gu)*fu,t,T),t, M, T);I4 = int((M-t)*ft,N,M);f4=(A+Cp*I1+Ch*I2+Cp*Ic*I3-p*Ie*I4)/T;求出f4关于T的函数