MATLAB - has

Documentation

---

Check if expression contains particular subexpression

~Example:

syms x y z
has(x + y + z, z)
 
ans =
  logical
   1
 
has(x + y, z)
 
ans =
  logical
   0

syms x
f = int(tan(x^7), x);
has(f, 'int')
 
ans =
	logical
		1