-20*ln10+10-0.1
    -4*ln4+4-0.25
    1+2=
    A(3,2)
    48192/4.8%×（1-1/（1+4.8%）^32)×(1/(1+4.8%)^8)
    34910/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    23➕25
    （4/5+1/2）*2=
    407/4-√16180/2
    407/4+√16180/2
    arctan(sqrt0.5)
    arctan(sqrt1/2)
    2.75*2^-0.3779
    2.75*2^-0.3779
    atan(sqrt(2)*tan180)
    atan(sqrt(2)*tan0)
    atan(sqrt(2)*tan90)
    atan(sqrt(2)tan90)
    atan(tan90)
    atan(tan90)

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