arctan1
    arctan(-1)
    3.33/(2.26*10^-6)
    √880
    3.33/2*10^-6
    25/(8.314^2*160000)
    e^0.00076
    e^7.6*10^-4
    （1*2）^2
    1-2
    -5-1
    7-3√5
    7+3√5
    7+3√5×7-3√5
    √2^4
    √2^5
    1-√2
    √2
    √2 ^2
    √3 ^2

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