sin2x/π
    sinx
    X-188=（1-45%）x
    1380xx-1269600x+159500000=0
    1380xx-1269600+159500000=0
    1380xx-1269600x+145000000
    xx-920x+66667=0
    xx-920x+105872=0
    xx-920x+105072=0
    1303.93*(20+x)^-1.4+1.48*(x-20)=298.15
    x^2-6x-21=0
    1380xx-1269600x+145000000=0
    90=arctan0.5w+arctan0.05w-arctan0.23w
    10^(-10)x=cos(x)
    xxx=xx
    cosx=x
    x^x=6
    x^x=4
    x=24.088-7.829*lg60
    x=24.088-7.829*lg152

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