(2/e)*(arctan(e)-arctan(1))
    (2/e)*[arctan(e)-arctan(1)]
    (2/e)*[arctan(e)-arctan(1）]
    (1/e)*[arctan(e)-arctan(1/e)]
    (1/e)*[arctan(e)-arctan(1/e)]
    (1/e)*[arctan(e)-arctan(1/e)]
    ［1748×（1+0.0586）×1.0606×1+0］×0.9821
    ［1-1/（1+8.0%）^49.36］/［1-1/（1+8.0%）^70］
    sqrt(9)
    3/400-1/2+1/8
    1-1/2+1/8
    0.96×(55×3.2+40×3.6+45×1.7)
    1/9801
    arctan(－11)
    (243.61-9×10)×0.311-2×4.7×√0.311+9×10
    (18.9×3.43)/53.8
    0.888/0.321
    5.2/16.2
    0.888/0.352
    5.57/15.83

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