Hello i hope anyone can help me with the following problem.
i have the following code
T_w,y,T_m,k_f,rho_f,U_0,h_mstar,R, alpha, delta = var('T_w y T_m k_f rho_f U_0 h_mstar R alpha delta') T=T_w+y(-2(T_w-T_m)/delta+rho_fU_0h_mstarcos(Phi)/k_f)+y^2((T_w-T_m)/delta^2-rho_fU_0h_mstarcos(Phi)/(k_fdelta)) u=-6U_0Ry(y-delta)sin(Phi)/delta^3 integralTu=integrate(Tu,y,0,delta)
now i would like to differentiate integralTu with respect to x (diff(integralTu,x)), but delta must be a function of x (i first defined it as a variable because of the integration).