如何求解三元三角函数方程组

[refoxpro]

这是一个空间三维机器人转角的变换矩阵，thet1,thet2,thet3,为未知量

5*cos(thet1)*(31*sin(thet2)*cos(thet3)+31*cos(thet2)*sin(thet3)-128*sin(thet2)*sin(thet3)+128*cos(thet2)*cos(thet3)+114*sin(thet2)+30)＝790

5*sin(thet1)*(31*sin(thet2)*cos(thet3)+31*cos(thet2)*sin(thet3)-128*sin(thet2)*sin(thet3)+128*cos(thet2)*cos(thet3)+114*sin(thet2)+30)＝0

155*cos(thet2+thet3)-640*sin(thet2+thet3)+570*cos(thet2)＝725

各位高手如何求其中的三个thet解，多谢

[anbcjys]

三个方程三个未知数，可以解出具体值，但是不值一个，是不是有范围要求

[refoxpro]

对,你说得对,有多个解,问题已经解决,一式与二式先平方,再相加就可求出