arctan(4/300)
    arctan(4/200)
    arctan(4/200)
    arccos0.9194597023392693350470828669292064106486
    arcsin0.0472=
    370980/1.13
    280.69/6.5% ×(1-[1/(1+6.5%)^5]
    344.12+0.45+0-63.43
    3.44+1.5+1.2+57.29
    344.12/(1+5%)×12%+344.12/(1+5%)×5%×(1+5%+3%+2%）
    30.3×(4.52%-0)×12
    （0.01+0.0002）×33%
    （2606.5+104.26+60.30）×33%
    （0.01+0.0002）×25%
    （2606.5+104.26+60.30）×25%
    [1-26.5/（26.5+23.5)×（1-2%)]×100%
    [1-26/（26+24)×（1-2%)]×100%
    arccos0.9657935483870967741935483870967741935483
    cos20
    arccos0.9715715785880156959258350629745155382137

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