How do I incorporate an interval ?

How do I incorporate into this code that i want to see the local maximum and minimum in this interval x ∈ (-2, 1) ?

syms x
f = 2*x^3 - 3*x^2;
f1 = diff(f);
maxmin = solve(f1)

maxmin = 

Answer 1

[Torsten]

Add the line

maxmin = maxmin(maxmin>-2 & maxmin<1)

to your code.