tan(20/360)/0.977777777777
    1+2(x+ 3) = 4 + 4(x - 6) - 7
    x^2-3.74x+0.01916=0
    19.2^0.103=1.624-0.0041k
    arccos(0.9777777777)
    x^(2)+x-1=0
    x^2-374x+0.01916<=0
    cos(-0.606091)-sin(-0.606091)+sin(-0.606091)cos(-0.606091)
    arccos0.9777777777
    x^2-374x+0.01916=0
    cos2x=sinx+cosx
    346800*x^2+0.00264(x-2.5) = 304800x
    346800x^2+0.00264(x-2.5)=304800x
    8000+7200+x=3*（x-400）
    (x+5)/8=(x+6)/7
    x^2+5=0
    0.000007176802613=[1/(500-x)]^2-[1/(800-x)]^2
    0.000001259=(1/(500-x))^2-(1/(800-x))^2
    60*(1-((1/1+x)^10)/x=324.3
    152x*x+633x+3*177=0

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