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
    sqrt(1+x^2)*sqrt(1+(0.5x)^2)=7
    sqrt(1-x^2)*sqrt(1-(0.5x)^2)=7
    sqrt(1-x^2)*sqrt(1-0.25x^2)=7

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