how to use symbolic betainc?

I have a problem when I try to use the incomplete beta function, I declare the variable with syms, but when I try solve the problem, matlab says(??? Undefined function or method 'betainc' for input arguments of type 'sym'.)

How can I solve this?

before of all, Thank you.

Answer 1

[Sean de Wolski]

betainc is not defined for symbolic inputs:

doc betainc

[Daisson]

Thank you man by now I will try solve this making a specific function that accepts symbolic inputs.