Formula node undefined variables

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/v2;
b=h/L;
x=((0.5-ab)/a
2)+sqrt((((0.5-b)/ab2)2)-(((b2)+1)/a2));
y=((0.5-b)/a2)-sqrt((((0.5-ab)/ab2)2)-(((b2)+1)/b2));
A=acos(1/sqrt(x
3));
B=acos(1/sqrt(y**3));

You may want to attach a picture of the node so that we can see what is on the edge, etc.

Greg McKaskle