>> a=98.841*pi/180;x=fzero(@(x)1.3718*cos(x*pi/180)-2.1181*cos(x*pi/180-a)-0.3482-cos(a),35)结果：x = 34.9022
solve('1.3718*cos(x)-21*cos(x-98.841)-0.3482-cos(98.841)')
