sin27
    cos144
    sin144
    arccos0.15
    arcsin0.15
    arcsin0.8
    sin0.8
    （15+X）/（5+X）=2
    130000(1+x)^20+130000(1+x)^19+130000(1+x)^18+130000(1+x)^17+130000(1+x)^16 = 1085376
    s^3+s+1=0
    -6-x+3x^2-0.5x^3
    x+1 x=5
    x+1
    a/（5.76a+937.5+4464.3）=0.1
    x/（5.76x+937.5+4464.3）=0.1
    1.23^0.05
    （0.021*0.057^1.85+161.23）^0.05
    sqrt(645)
    ((110.8-110)*2+(109.4-110)*2+(111.2-110)*2+(109.5-110)*2+(109.1-110)*2)/5
    9000/(1-(1.09)^(-3))

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