x^3+x^2-x-3/8+sqrt(5)/8=0
    x^3+x^2-x-3/8-sqrt(5)/8=0
    4X^（2）-3√10X+5=0
    434548.4=151881.6*(1/t+1/(t^2)+1/(t^3)+1/(t^4)+1/(t^5))
    434548.41=253136/(1+x)+253136/((1+x)^2)+(253136)/((1+x)^3)
    (t*(t^2-2*t+1))/(1-t)=(434548.41)/253136
    -450+x-x*8%/4-690=500
    x/ln（x）
    1-2^a/1
    s(s^2+24s+144)=(s+20)((s+12)^2+2s(s+12))
    x^2+1/4*x^2=8
    5/4*x^2+2*x+8=2*sqrt(2)
    sqrt(5/4*x^2+2*x+8)=sqrt(x^2+1/4*x)
    30*sqrt(3)+sqrt(2)/2*x=(90-sqrt(2)/2)/sqrt(3)
    30*sqrt(3)+x=(90-x)/sqrt(3)
    30*sqrt(3)-sqrt(3)*x/3=30*sqrt(3)+x
    90*sqrt(3)-sqrt(3)*x=30*sqrt(3)+x
    -10*x^2+60*x-900=0
    =(147+x)/12
    cos7x

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