arccos2.5/2.4
    arccos3/2.04
    A(3,2) A(3,2) A(3,9)
    A(3,2)
    1÷㏒10
    1/e
    -2*80*80+340*80-12000
    4115226337448559670781893×27
    1/8.1
    6943319*2791*9
    arctan1
    arctan-1
    arctan-1
    964.66×［1-1/（1+8.0%）^49.1］=
    cos（10π-π/4）
    100*225
    -1/2
    -1/22
    2arctan(0.2/86)=
    arctan(2/86)=

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