(x-51.65)/x=10%
    (x-51.65)/x=5%
    (x-51.65)/x=11%
    (x-87.51)/x=3%
    X^3-4X^2+2X-3=0
    x-10+x+1+x/2+2x=4.5x-9
    x-10+x+1+0.5x+2x=4.5x-9
    tanx=tan4π/9+2cos2π/9
    sin(4π/9-D)*sin(4π/9-D)+sinD-3sinD/((4(sin2π/9)*(sin2π/9)))=sin(4π/9-D)
    sin(4π/9-D)*sin(4π/9-D)+sinD-3sinD/(4(sin2π/9)*(sin2π/9))=sin(4π/9-D)
    -2a+4(19-7a)=16
    sin(4π/9-D)*sin(4π/9-D)+sinD-3sinD/(4sin2π/9*sin2π/9)=sin(4π/9-D)
    sin(4/9π-D)*sin(4/9π-D)+sinD-3sinD/(4sin2/9π*sin2/9π)=sin(4/9π-D)
    sin(80-D)*sin(80-D)+sinD-3sinD/(4sin40*sin40)=sin(80-D)
    tanx=tan80+2cos40
    2^x
    sin(80-x)*sin(80-x)+sin(x)-(3*sin(x))/(4*sin40*sin40)=sin(80-x)
    X+1=5
    sin(4/9π-x)*sin(4/9π-x)+sin(x)-(3*sin(x))/(4*sin2/9π*sin2/9π)=sin(4/9π-x)
    sin(4/9-x)*sin(4/9-x)+sin(x)-(3*sin(x))/(4*sin2/9*sin2/9)=sin(4/9-x)

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