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    X+2=5
    secx^2-tanx^2=1
    arctanx=2
    arctanx=2
    arccotx=2
    secx-tanx=1/20
    x^x=(1/2)^(1/2)
    sqrt(cscx^2+1)=2
    lnsecx-esecx+2secx^3=0
    arctancotx-1/2cotx=0
    (1/(x^2+9)^0.5)-(1/((x+0.25)^2+9)^0.5)=3.1415926/100
    2000*5=X*(1000+150)*5
    2000*50000=X(1000+150)*50000
    2000*5=X(1000+150)*5
    0.2x+x=74000
    3.8375=((28.02*0.639(x+0.1))/(1+0.639(x+0.1))*((100-6.66-1.14)/100)*(1/(1+0.31*1.14))+((0.76(x+0.1))/(1.3*0.101325))
    2x^3+11x^2+20x+10=0
    4x^2+8x-2=0
    4x^3+24x^2+30x-8=0
    2x^3+11x^2+20x+10=0

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