4*13+9*13
    169-117
    117/9
    468/4
    √468
    3.1415926*0.03^2/4
    3.1415926*0.03^2
    (4.97316*sin(110)/sin36.707582)
    sin(0.034*45.5)/sin(0.034*15.68)
    arctan{sin(1.56944)/{2+cos(1.56944)}}
    arctan{sin（1.56944）/{2-cos（1.56944）}}
    5.36203*sin(60.638489-23.160829)/sin23.160829
    arctan(0.027)
    sin(01.57)
    sin(1.57)
    0.034*46.16
    4889024.341/(3141285.26*180)
    3*10^(-6)*(((73.2+32)^2-(2.31+32)^2)/40.2)
    3*10^(-6)*(((73.2+20)^2-(2.31+20)^2)/40.2)
    1232542.327/(3141285.26*1)

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