x*0.786151+arctan0.786151=2*arctan1
    √（w^2+1）/（w^3+w）=1
    3x^2+24x+32=0
    cos(134)=(3600+146.03^2-x^2)/(120*146.03)
    x^2=3ln(x+1)
    x^4-4x^2+3 = 0
    x^4-4x^2-1=0
    （0.75）^n*768=7
    4xe^(-x)-1=0
    m^3+7m^2-256m-1792=0
    5000*20+100000*0.1875=5000*x*(1-0.05)-200000
    arctan（5*w）-arctan（10*w）-arctan（0.25*w）=-1*2*arctan1
    b^4-305b^2+12544=0
    b^2-305b+12544=0
    b^5-193b^3-112b^2+12544=0
    x^2-14x+40
    103b^2-72√7b-1008=0
    arctan（2*w）+arctan（w）=2*arctan1
    -6x^2+12x+4=0
    tanx=2x

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