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    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
    x∧2-x-1=0
    x∧2-x+1=0
    x2-x-1=0
    x(x+6)=9
    x(x-6)=9
    8100(x+26)=9900x

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