(X-X/1.13*0.13)/7.27=0.074
    (X-X/1.13*0.13)/7.29=0.074
    X-(X/1.13*0.13)/7.29=0.074
    a=(sqrt35-1)/2 (2b+1)^2/(b^3(b+1)^3)=1-2/3sqrt2 c(c+1)=1/(2ln3-3ln2)
    120=2x*x+14x
    1080+（x－36000）×10％=6000
    x*0.2+x=80
    sina+2cosa=2
    8x^2-x-1=0
    (x+x×0.75)×2=70
    (x+x3/4)×2=70
    arccotx^2-5arccotx+6
    t*arctant-1/2ln(1+t^2)
    arcsinx=0 arccosx=0 arctanx=0 arccotx=0
    arccotx=1
    sincotx+coscotx=sqrt2 log(3,cscx)=3
    cotx^2+2cotx-3=0
    sinx^2+cosx^2=1 x+sqrt(x^2+1)=0
    sinx^2-cosx^2=sinx^4-cosx^4 x^2+1=0
    4X^2+4X-35=0

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