arctan1
    arctan2.128
    arctan-1.128
    arctan-0.358
    arctan-0.358
    arctan0.317
    arctan3.17
    arctan3.17
    arctan（0.24÷4）
    sqrt7.7668
    sqrt7.766845
    7.656289+0.110556
    2.7670*2.7670
    0.3325*0.3325
    10^6/18
    －lg1.1
    (250+270)/2*2+(270+260)/2*2+(260+300)/2*3+(300+290)/2*3+(290+320)/2
    arcsin½
    arcsin½
    arctan0.15

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