(0.17×10^6)/33750
    (54.12×0.16×0.16)/8
    (54.12×0.16×0.16)/8
    （0.3+24×1.8+1.5×1.8）×0.9
    0.9×(1.3×(0.3+24×1.8+1.5×1.8)+1.5×(2.5+2))×0.9
    arccos0.432113
    arccos0.432113
    arccos0.901820
    arccos0.902462
    arctan4
    arctan3.2
    arctan1.6
    arctan(π/4)
    arctan1
    arctan1
    arctan(π/4)
    arctan1
    1/999.997
    400*300*100%
    400/300

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