90-arctan(0.1*x)-arctan(0.2*x)=46
    250sqrt(1+(0.052x)^2)/(x*sqrt(1+(0.1x)^2)*sqrt(1+(0.01x)^2)*sqrt(1+(0.004x)^2))=1
    250/(x*sqrt(1+(0.1x)^2)*sqrt(1+(0.01x)^2))=1/sqrt(13)
    250/(x*sqrt(1+(0.1x)^2)*sqrt(1+(0.01x)^2))=1
    30/(x*sqrt(1+0.01x^2)*sqrt(1+0.04x^2))=1
    30/(x*sqrt(1+(0.1x)^2)*sqrt(1+(0.2x)^2))=1
    100*sqrt(1+(2.5x)^2)/(x*sqrt(25+x^2)*sqrt(1+(10x)^2))=1
    100*sqrt(1+(24.8x)^2)/(x*sqrt(25+x^2)*sqrt(1+(11.3x)^2))=1
    100*x/(4*sqrt(25+16))=1
    100*sqrt(1+(2.48x)^2)/(x*sqrt(25+x^2)*sqrt(1+(1.3x)^2))=1
    x*4*0.22=10
    100x/(4*sqrt(29))=1
    90-arctan(x/5)=45+6
    100*sqrt(1+(0.13x)^2)/(x*sqrt(25+x^2)*sqrt(1+(0.01x)^2))=1
    100*sqrt(1+(0.13x)^2)/(x*sqrt(25+x^2)*sqrt(1+(0.1x)^2))=1
    100*sqrt(1+(0.126x)^2)/(x*sqrt(25+x^2)*sqrt(1+(0.055x)^2))=1
    100/(x*sqrt(25+x^2))=1/(sqrt(2.3))
    100*sqrt(1+(0.13x)^2)/(x*sqrt(25+x^2)*sqrt(1+(0.06x)^2))=1
    100/(x*sqrt(1+x^2))=1/(sqrt(2.2))
    100=x*sqrt(25+x^2)

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