How can I solve two nonlinear equations?

2013 4 15
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I have two equations:
1: x1+x2=a-b*cos(th)
2: x1^2+x2^2=c-d*cos(th)
where th is the inputvariable; a,b,c,d are constants; and x1 and x2 are the output variables. How can I solve these equations using matlab such that I get two separate symbolic expressions for x1 and x2, as a function of th? Thank you in advance,

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Azzi Abdelmalek
Azzi Abdelmalek 2013-4-15
编辑：Azzi Abdelmalek 2013-4-15

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syms x1 x2 a b c d th
solve(x1+x2-(a-b*cos(th)), x1^2+x2^2-(c-d*cos(th)),x1,x2)

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