arctan(2.11/-3.18)
    (3.18^2+2.11^2)^0.5
    -5*0.3*sin240-40/3*0.2*sin300-10*0.3*sin30
    -5*0.3*cos240-40/3*0.2*cos300-10*0.3*cos30
    arctan(0.28/2.83)
    (2.83^2+0.28^2)^0.5
    -10*0.4*sin120-10*0.3*sin240-20/3*0.2*sin300
    -10*0.4*cos120-10*0.3*cos240-20/3*0.2*cos300
    900*101.8/((3.1415926)^2*620^2*0.01)
    0.5*(200-116.67)*((104.16-14.58+30)*3.1415926/180)+0.5*116.67*14.58*3.1415926/180
    0.5*(200-116.67)*((104.16-14.58)*3.1415926/180)+0.5*116.67*14.58*3.1415926/180
    116.67/8
    50+130*(116.67-200)/-200
    116.67/8
    8*116.67
    900*3500/((3.1415926)^2*1000^2*5)
     arctan(104.08/32.52)
    arctan(104.08/32.52)
    arctan(0.1042/0.0325)+180
    (4*546/(3.1415926*5*7.8))^0.5

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