0.7156*cos(x)+1.09158*cos(x)*sin(x/2)-0.23855 = 0
    0.7156*cos(x)+1.4092*cos(x)*sin(x/2)-0.23855 = 0
    x^2+x^2=625
    x^2/(0.05-x)=18.5
    x^2-3x-18=0
    (1-x)^3+3*x=1
    103（1+x）=121
    x^2-(825/32)x+8775/256
    5.05x^2=3.33(1-x)
    (x^2+1)^2(64*x^2-48*x-24)-(4*x+2)^2
    14x-x^2-48=0
    x*0.96*1.45*1.05=3.42
    4*n^2-11n+9=0
    4*n^2-13n+12=0
    4*n^2-13+12=0
    95.83=xln（610/x）
    e^（95.83）=（1/x）^x
    2.39*0.96*x*1.05=3.27
    5X+13=28
    59x+x²=2400

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