how to get function value at any input, after solving Differential eq. using dsolve

Solution to below diff . eq. using dsolve command is:
Z= dsolve('Dy=1+t.^2','y(1)=-4');
Z=(t*(t^2 + 3))/3 - 16/3
Now how to write code to get the value of Z at t = 2

 采纳的回答

syms t y(t)
Z= dsolve(diff(y,t)==1+t^2,y(1)==-4)
Z = 
Z_at_2 = subs(Z,t,2)
Z_at_2 = 
Z_at_2_numeric = double(Z_at_2)
Z_at_2_numeric = -0.6667
fplot(Z,[-2 2])
grid on

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