s^2+0.2s+1=0
    x＾2/0.1-x=5.56×10＾-10
    (1-sin(x))/(1+sin(x))=0.16
    sqrt(x^2+0.49x*25)/(5*sqrt(26))=1
    90+arctan5x-arctan5=50
    90+arctan5x-arctan5=40
    x^2+16x-650=0
    x^2=4.31*10^(-7)*(0.1-x)
    x-11674.19=0.15x*0.05/10.5
    x^7+x+1=0
    x=tanx
    10077.75=x+0.06x
    100020.67=x+0.06x
    x+x÷2=x
    cosx=1-10^-1.75
    i^2
    pi
    e^(-pi)
    30sqrt(1+(2.6x)^2)/(x*sqrt(1+0.01x^2)*sqrt(1+0.04x^2)*sqrt(1+(17.3x)^2))=1
    30x/(3.6*sqrt(1+0.01*3.6^2)*sqrt(1+0.04*3.6^2))=1

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