ln0
    0.6834^1/2
    arctan0.1029
    atan0.8849557522
    atan(0.8849557522)
    atan22.6
    atan22.6
    sin30
    sin30
    sin30
    sqrt(-1)
    sqrt(9)
    3^^^^3
    3^3^3^3^3
    3^3^3^3
    3^3
    72+4000
    !(!(5))
    √√-1 √-1 x^4<-1 x^2-3x+4≥0
    √（-1）^2

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