MATLAB int function problem while evaluating a symbolic definite integral

this is my code

syms x y z  b 
assume(b, 'positive')

h(x,y,z) = z /(x^2 + y^2 + z^2)^(3/2) ;
int(h, x , [0 b])

i want to get the result of this integral wich is:

(2 b z)/((y^2 + z^2) Sqrt[b^2 + y^2 + z^2])

but instead i get :

ans(y, z) =

piecewise(y^2 + z^2 == 1 & ((z^2)^(1/2) == z | z + (z^2)^(1/2) == 0), (b*z)/(b^2 + 1)^(1/2), y^2 + z^2 ~= 1 | (z^2)^(1/2) ~= z & z + (z^2)^(1/2) ~= 0, int(z/(x^2 + y^2 + z^2)^(3/2), x, 0, b))

what can i do to get the first answer ? is there something wrong in my code ?

[Walter Roberson]

Your proposed answer is not correct when there are certain relationships between the complex values x, y, z .

You have the assumption that b > 0, which implies that b is real, but the calculation needs to take into account that x, y, z are complex.

Answer 1

[Walter Roberson]

simplify(ans, 'steps', 100)

[Emmanuel Florez Buitrago]

thank you very much!!!!!!!