√((6×277.2)/(19.8×(1.4×1.669-0.599) ))
    (6.7×19.8×3.76+43.3×10.67)/(2.04×19.8+2.4×19.5+9.56×19.8+60)
    (6.7×19.8×3.76+43.3×10.67)/(2.04×19.8+2.4×19.5+2.86×19.8+60)
    (6.7×3.76×6.4+43.3×10.67)/(2.04×19.8+2.4×19.5+2.86×19.8+60)
    (6.7×3.76+43.3×10.67)/(2.04×19.8+2.4×19.5+2.86×19.8)
    (6.7×3.76+43.3×10.67)/(2.04×19.8+2.4×19.5+2.86×19.8+60)
    26×3+24×1
    arccos(0.917013955)
    arccos(0.85324459)
    arccos(0.85324459)
    arctan(0.25070)
    arctan(14.4)
    arctan(14.364613)
    arctan(0.376809)
    arctan((tan20)/(cos15))
    arctan21.58960662868
    arctan（0.3768）
    arctan0.3768
    （3.47-3.47/1.13*0.1+0.0365）/7.16=
    （3.72-3.72/1.13*0.1+0.0365）/7.16=

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