Mathematics
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    lnx(x+1)-3*x+3=0
    2n*n-4n-23=120
    sin(x)=0.253
    (cosx)^3-2×(sinx)^2×cosx
    (cosx)^2×sinx
     arctanx+arctan5*x = π/3
    arctanx+arctan5x = 60
    arctanx+arctan5x=π/3
    arctanx+arctan5x=60
    x/(x^2+4)^2
    x/(x^2+4)^3/2
    arctanx+arctan5x=60
    x/(x²+4)^(3/2)
    x/20+x/30+x/42=3
    x
    70*10^6=23*250x(565-x÷2)
    70*10^6=26*250x(565-x÷2)
    70*70^6=23*250*x(565-x/2)
    x=5/4÷2
    2x+x=5/3

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