arccos（-0.5）
    atan[(√3）/5]
    atan[(√3）/2]
    atan(√3）
    atan0.5
    2590.7/2.9=
    545.6×1000000/(0.9×650×360)=
    1/12×1.35×1.35×(5.5×598.97+298.27)=
    (350.91-248.06)×2.9=
    248.06+350.91=
    2.9×2+0.7=
    350.91×2.05/2.9=
    350.91×1.64=
    350.91×1.10=
    2809.45/8.16+68.51×6/(2.4×3.4×3.4)=
    2809.45/8.41-68.51×6/(2.9×2.9×2.9)=
    2809.45/8.41+68.51×6/(2.9×2.9×2.9)=
    2.9×((2.9-0.7)×0.5-0.65)-((2.9-0.7)×0.5-0.65)×((2.9-0.7)×0.5-0.65)=
    2.9×((3.9-0.7)×0.5-0.65)-((2.9-0.7)×0.5-0.65)×((2.9-0.7)×0.5-0.65)=
    2809.45/8.41-68.51×6/(2.9×3.9×3.9)=

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