matlab求解方程组在某范围内的解

matlab求解方程组在某范围内的解这里adcadc为3个角度，范围都是0~π，

用vpasolve函数可以求得：

a =0.56905902174190874945249713204175

 c =0.059814651750922046381576164649624

 d =9.8493426555706931819545996771277

>> syms a c d

>> [a c d]=vpasolve(25800*cos(a)+sqrt(4400^2+780^2)*cos(d)==-3400+21100*cos(c),25800*sin(a)+sqrt(4400^2+780^2)*sin(d)==10800+21100*sin(c),21100*cos(c)+17978*cos(pi-d-atan(780/4400))==35900)

验算：

 >> eval(21100*cos(c)+17978*cos(pi-d-atan(780/4400)))%

ans =       35900

9.多弧度已经超范围了，这个问题已经解决了