sin（cosx）=π^e
    sinx/cosx=0
    sinx/cosx=0
    sinx/cosx=secx/cscx
    5X^2-16X+12＝0
    log（3x，x）=eπ
    log（3x，x）=eπ
    (10.8*y+1100*14.1)/(y+1100)=12
    (10.8*y+11000*14.1)/(y+11000)=12
    3x^2-6x-4=0
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1000000
    （42.309+x）×1.55＝42.309+74.418-x
    （42.309+x）×1.55＝42.309+73.918-x
    x^2-40x=1560
    20/（x-20)=(x-20)/98
    x^2-40x=1560
    x-x*0.015=979792.62
    sinx=tanx
    sinx=tanx
    sinx=sin-x

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