arctan0.083
    1.2*0.2317*(0.909*ln(319.45/293.15)-8.314/32*ln(0.5075/0.22))+0.8*(0.909*ln(319.45/363.15)-8.314/32*ln0.5075)
    1.2*0.7683*(1.03925*ln(319.45/293.15)-8.314/28*ln(0.4925/0.79))
    0.8*(0.909*ln(319.45/363.15)-8.314/32*ln0.377)+1.2*(1.0045*ln(319.45/293.15)-8.314/29*ln0.623)
    1/(0.158/44+0.0575/32+0.062/18+0.7225/28)
    0.158/44+0.0575/32+0.062/18+0.7225/28
    0.158/44+0.0575/32+0.062/18+0.07225/28
    1/(0.158/44+0.0575/32+0.062/18+0.07225/28)
    286.33/10.60
    arctan(5/(2+5/tan60))
    arctan(10/(2.5+10/tan70))
    arctan(tan35*cos345)
    arctan((tan35*cos15-tan35*cos345)/(tan35*cos345-tan35*cos15))
    arctan(tan40*cos340)
    √28
    -4+√28
    4²-4*-3*15
    (1.8-0.331)/2+0.331
    √1081
    (39+√1081)/2

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