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Question: recursive assignment

Question:recursive assignment

zyjfeelsgood 5
student ode assignment
March 12 2013
1 
part of my codes are:
func[1] := (1/2)*(c+s)*x[1]+s*x[3]+(s-c)*x[1]*x[2];
func[2] := (1/2)*(c-s)*x[1]+s*x[3]+(s+c)*x[1]*x[2];
func[3] := -b*x[2]-x[1]^2; 
They are just three ODE , how to fix the error?Where is the so-called recursive assignment...?
The program works well when:
"func[1] := x[2] + (x[1]^2 - x[1]*x[3]);
func[2] := - x[1] +  (x[2]^2 + x[1]*x[4]) + x[2]^3;
func[3] := - x[3] + x[1]^2;
func[4] := - x[4] + x[5] + x[1]^2;
func[5] := - x[4] - x[5] + x[2]^2;
"
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