im having programming issues with formula nodes. It says i have undefined variables and I defined everything.Can someone please.

h=50;

v=5;

a=4.9L/v**2;
b=h/L;
x=((0.5-ab)/a**2)+sqrt((((0.5-b)/ab

**2)**2));

**2)-(((b**2)+1)/ay=((0.5-b)/a

**2)-sqrt((((0.5-ab)/ab**2)

**2)-(((b**2)+1)/b

**2));**

A=acos(1/sqrt(x3));

A=acos(1/sqrt(x

B=acos(1/sqrt(y**3));