1.5×x+1.5×1=1.25×3x-1.25×2
    -90-arctanx/2-arctanx/20=-180
    (s+1)(s+4)s=(s+2)((s+1)(s+4)+s(s+4)+s(s+1))
    3.14/(sqrt(1-0.35^2)*x)=0.5
    e^(-3.14x/sqrt(1+x^2))=0.36
    -90-arctanx/2-arctanx/20=-180
    -90-arctanx/2-arctanx/20=0
    a+1=-a^2sqrt(2)
    arctanx+90=45
    180+arctan(x)=45+360
    180+arctan(x)=45
    180+arctan(sqrt((x^2+sqrt(x^4+4))/2))=45
    180+arctan(sqrt((x^2+sqrt(x^4+4))/2))=45+360
    180+arctan(sqrt((x^2+sqrt(x^2+4))/2))=45+360
    180+arctan(sqrt((x^2+sqrt(x^2+4))/2))=45
    arctan(sqrt(x^4-1))+90=180+45
    arctan(sqrt(x^4-1))+90=-45
    arctan(sqrt(x^4-1))+90=45
    -0.8*57.3*x-arctan(x)=-180
    -0.8*57.3*sqrt(x^2-1)-arctan(sqrt(x^2-1))=-180

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