i^2024
    sincotx-cos2=0
    1/cosx^2-tanx^2=1
    1/cosx^2-tanx^2=1
    21x^2-85x+84=0 21x^2-13x-84<=0 7536*24987 sin2tan2-cos2cot2 751/2731-5386/9973 774144 1,1,2,3,5,8,13,21,34,55
    （1606-X）/X=0.55
    x^2-50x+600=0
    0.5=2/3*2x/(2x+1)
    0.5=x
    7600/（x+26.88)+10000/(x+13.44+22.4)+10000/(x+13.44)=150
    X^3+56*X^2=531
    256*x*x+100*x*x=40.6*40.6
    X^3+56*X^2=531
    9.482142857=X^3+X^2
    X^3/400+X^2/400*56=1.3088619
    X/10/2*X/10/2*(X+56)=1.3088619
    x*（51-3x）=210
    -15000+x-x* 0.02=4500
    -15000+x-x* 0.08/4=4500
    x^4-2*x^3-x^2-2*x+1=0

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