12-√(12^2-633.4/(π×4)×1.651)
    (π×4×(2×12-9.5)×9.5)/(ln 138.6/2+0.267)
    12-√(12^2-333/(π×4)×1.651)
    (π×4×(2×12-9.5)×9.5)/(ln 138.6/1+0.267)
    12-√(12^2-170.9/(π×4)×1.651)
    0.241464^0.5
    0.241464^1/2
    (π×4×(2×12-9.5)×9.5)/(ln 138.6/0.5+0.267)
    138.6/（2*sin（（30*π）/30））
    cos80*cos80
    cos70*cos70
    cos60*cos60
    cos50*cos50
    cos40*cos40
    cos30*cos30
    cos20*cos20
    cos10*cos10
    (136.5+12.042+72+136.5+12.166)/2π
    cos0*cos0
    cos0^2

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