log(10,100000)
    log(2,100000)
    arccos(0.2/0.1806352330952756251)
    arccos0.02/0.1806352330952756251
    arccos0.2/0.1806352330952756251
    arctan2.9746
    arctan1.7444
    arctan1.7444
    arctan0.7698
    arctan0.01596
    arctan0.01596
    tan（arccos0.64）=
    tan（arccos0.63）=
    arctan6.65=
    6+（1/6）
    12.5%
    sinπ/2
    sin（0.7776π)
    arctan(11/9.8)
    95.72/6.5% ×(1-[1/(1+6.5%)^5]

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