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
    50.08/(1+8%)^2
    338.80*(1+0.1)=
    (1.1×1388)/20
    (1.1×1388)/100.8
    π×4×((2×12-9.5)×9.5)/(ln(1+138.6/55.9))
    2×10×√(12×4)
    e(0.045)
    sqrt(3*e)

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