s^3+2s^2+3=0
    x*x+2√x*x-4=26
    x*x=4
    1/6x+1/7x+1/12x+5+4=1/2x
    1/6x+1/7x+1/12x+5+4=x
    1/6+1/7+1/12+5+4=x
    4x+2sin2x＝3.14159
    4x+2sin2x＝3.1415926
    x+（sin2x）/2＝1.5707
    1800/x-1.5 1800/x=20
    x+（sinx）/2＝1.5707
    0.9x+4.2=6
    0.9x+4.2=6
    x+1/2sin2x＝1.5707
    sinx=sin80/(2*sin50)
    56.2+x=96.41
    sinx=sin80/(2*sin50)
    1/6x+1/7x+1/12x+5+4=1/12x
    b
    （x-40）（-2x+200)=1600

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