cos（cosx）=cosx
    cos（cosx）=cosx
    160=0.925*(160+x)
    1+lnx
    （x-4896）*0.3=200
    V=466.66+110.00+23.07+0.01V+23.16+0.0002V+124.58+0.0020V+0.0529V
    8-2t=4+t
    10cosx-10cosx(cosx+sqrt((cosx)^2+2sinx+11/5))=10
    441x+420（50-x）=20970
    ln2x-x+2=0
    x-2=ln2x
    441x+420（50-x）=20970
    50*sin(x)/sin(36)=20/sin(x+36)
    50*sin(x)/sin(36)=20/sin(x+36)
    1-2x=0.125*(2-x)
    0x=2
    10cosx-10cosx(cosx+sqrt((cosx)^2+2sinx+11/5))=10
    10cosx-10cosx(cosx+sqrt((cosx)^2+2sinx+11/5))=0
    10cosx-10sinx*(10cosx+sqrt(100*(cosx)^2-240-200sinx))/10=0
    10cosx-10sinx*(10cosx+sqrt(100*(cosx)^2-240-200sinx))/10=20

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