4000*cos(x)+((670*4000)/(sin(x)+206000*200.96))=4000
    0.133/x＝0.1289/0.86289
    0.4/100.58＝x/33.45
    0.1332/x＝0.1289/0.86289
    0.4/100.58＝x/33.5
    x^9=3^x
    (x+sqrt(x^2-1))(x-sqrt(x^2-1))=1
    arctan(2x)+arctan(3x)=45
    arctan(2x)+arctan(3x)=45
    -(x^3+xlnabsx-arctanx)/(ex+e(-x))=((-x)^3-xlnabs(-x)-arctan(-x))/(e(-x)+ex)
    2243.33=839.82*x+2766.60x*x
    1/x=2.035*lg(509148.42*x)-0.91
    4X²+12X-20=0
    (360-X)/((360*1.1)-x)=610/1235
    sinxsin100=sin40sin(80-x)
    cosx=1/6
    cosx=1/6
    cosx=1/6
    x÷[20+(x-24)÷2]=1.5
    X/2352*0.7=0.2*(1-X/2352*0.7)

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