sec2
    sec(1/2)
    sec1/2
    cos1/2
    sec2
    arccos(0.05/(2*0.6))
    0.337*sin38.91
    0.337*cos38.91
    arctan(1/1.238741)
    arctan(1/1.238741)
    (0.6*tan(75/2)+0.05/2)/0.5+1/tan75
    0.203*0.000002*732841*sin5
    (2*0.0003/8/3.14+(400+171)/6/8000)*0.0003/2
    (2*1.09*0.00001/8/3.14+(400+171)/6/8000)*1.09/2
    1/2*(3/4*0.0025*((1-0.33^2)/220000+(1-0.0077^2)/1052000)*0.203)^1/2
    400(0.048-0.01(1+sin25.3))*0.005/sin25.3
    0.05(1-0.6(1-cos75))-0.05*0.05*sin150/4
    arccos(0.05/1.2)
    1/cos(0.05/1.2)
    1/cos(0.05/1.2)

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