matlab解方程组,感激不尽.S3*COS(A3)=150cos(A1);S3*SIN(A3)=480+150SIN(A1);810COS(A3)+200COS(A4)-S=0;810SIN(A3)+200SIN(A4)=790A1=0,10,20,30,40,.360,求S S3 A3 A4

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