MATLAB: Non linear simultaneous equation

si

0.5*1.225*11.05^2*.71*2*(0+0.103*(0.169-Sigma)+(-.105)*deltaR)+0.44*.873*cos(Sigma)==0;
0.5*1.225*1.87^2*.2574*0.8-0.5*1.225*11.05^2*0.71*(0+(-.34)*(0.169-Sigma)+0.21*deltaR)==0;

Best Answer

I am not sure what you want to do with them.
Solving them is straightforward: 
syms Sigma deltaR 
Eqns = [0.5*1.225*11.05^2*.71*2*(0+0.103*(0.169-Sigma)+(-.105)*deltaR)+0.44*.873*cos(Sigma)==0; 
0.5*1.225*1.87^2*.2574*0.8-0.5*1.225*11.05^2*0.71*(0+(-.34)*(0.169-Sigma)+0.21*deltaR)==0;];
S = solve(Eqns)
Sigma = S.Sigma
deltaR = S.deltaR
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