MATLAB: Am I receiving unbalanced or unexpected parenthesis or bracket on the line of code

Question

I have but this line of code into MATLAB, however keep receiving the error unbalanced or unexpected brackets.

y1=exp(x2^2(Tow21(G21/(x1+x2*G21))^2+(G12*Tow12)/(x2+x1*G12)^2))

there is the same number of left parenthesis to right so I don't understand what I have done wrong?

Answer 1

x2^2(Tow21

is not valid syntax, hence the unexpected parenthesis.