matlab求解方程的时候出现 is not a valid expression or equation.程序如下:syms theta fai psai alpha;syms x y z;eq1='x*x*(1-cos(alpha))+cos(alpha)=cos(theta)*cos(psai)';eq2= 'x*y*(1-cos(alpha))-z*sin(alpha)=cos(psai)*sin(fai)*sin(theta)-s
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![matlab求解方程的时候出现 is not a valid expression or equation.程序如下:syms theta fai psai alpha;syms x y z;eq1='x*x*(1-cos(alpha))+cos(alpha)=cos(theta)*cos(psai)';eq2= 'x*y*(1-cos(alpha))-z*sin(alpha)=cos(psai)*sin(fai)*sin(theta)-s](/uploads/image/z/11574985-49-5.jpg?t=matlab%E6%B1%82%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%9A%84%E6%97%B6%E5%80%99%E5%87%BA%E7%8E%B0+is+not+a+valid+expression+or+equation.%E7%A8%8B%E5%BA%8F%E5%A6%82%E4%B8%8B%EF%BC%9Asyms+theta+fai+psai+alpha%3Bsyms+x+y+z%3Beq1%3D%27x%2Ax%2A%281-cos%28alpha%29%29%2Bcos%28alpha%29%3Dcos%28theta%29%2Acos%28psai%29%27%3Beq2%3D+%27x%2Ay%2A%281-cos%28alpha%29%29-z%2Asin%28alpha%29%3Dcos%28psai%29%2Asin%28fai%29%2Asin%28theta%29-s)
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