non-linear equations solution in matlab

when i tried this program code to solve w0,w1,w2, i got a error message that"undefined function or variable w1.the program code is

syms w0,w1,w2
exp1=(w0^2+w1^2+w2^2)-A0;
exp2=(2*w1*(w0+w2))-A1;
exp3=(2*w0*w2)-A2
sol=solve(exp1,exp2,exp3);
sol.w0;
sol.w1;
sol.w2;

please help me

Answer 1

[Walter Roberson]

Change to

syms w0 w1 w2

Answer 2

[Thomas]

syms w0 w1 w2 A0 A1 A2
exp1=(w0^2+w1^2+w2^2)-A0;
exp2=(2*w1*(w0+w2))-A1;
exp3=(2*w0*w2)-A2
sol=solve(exp1,exp2,exp3);
sol.w0;
sol.w1;
sol.w2;