400x^2+399x-1=0
    400x^2+399x-1=0
    400x*x+399x-1=0
    400x*x+399x-1=0
    400x*x+399x-1=0
    400x*x+399x-1=0
    400x*x+399x-1=0
    400x*x+399x-1=0
    400x*x+399x-1=0
    400x*x+399x-1=0
    400x*x+399x-1=0
    3x=99998
    3x=99999
    X/(1+x^2)^1/2
    (1+x/12)^12-1=
    1-1/(1+(h/95/2)^2)^(3/2) = 1.496/2.755
    1-1/(1+(h/100.5/2)^2)^(3/2)=(3.341-2.755)/2.087
    （X+88）/（1-3%%）=972
    （X+88）/（1-3%%）=972
    5sinx+4=4cosx+1

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