arctan(-0.3482)
    3*8
    (21-56/3)*1/2
    1＋1
    ((1.06)^2-1)
    ((1.06)^1.5)-1
    （1.06）^1.5
    1.01^365
    lg(0.2)
    （207.5-517.399725）/207.5=
    309.399725+208
    9.599557+0.643348*466
    1乘8
    90+arctan2
    8^1/2
    9^1/2
    4^1/2
    0.623/4
    90-arctan2-arctan(0.2*2)
    0.5705^(4)*125

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