MATLAB: Find common factors in two expressions

factorsymbolic

Is there some function so I can find a common factor in multiple expressions?
For example: syms x y
a= 5*(x^4/y)
b= 27*(x^4/y)
=> x^4/y is a common factor.
The reason I'm asking this is that I have some very long expressions I need to sum up. In order to shorten some stuff I would like to extract common factors and assign them to some variable. Thankful for any help!

Best Answer

syms x y
a = 5*(x^4/y);
b = 27*(x^4/y);
common_factor = gcd(a,b);
Result:
>> common_factor
common_factor =
x^4/y