e^x（2x-2+cosx-sinx）=0
    e^x（2x-2+cosx-sinx）=-1
    xlnx=16.13
    xlnx=4.26
    sinx^2=1/4
    sinx^2=1/4
    xex=100
    xlnx=10.1
    xlnx = 4.7
    xlnx = 10.1
    -90=-arctan(x/10)-arctan(x/100)
    7.5a²-350a+4082=0
    7.5a²-350a+4082=0
    （1-x）（4-x)^2-64(1-x)-32(4-x)=0
    0=arctan(x/5)-arctan(x/40)-arctan(x/167)
    1=75*√(((x/5)^2)+1)/(x^2)
    n*（n+2）=0.2021
    n*（n+2）=26510
    x+2/x=52
    -180=-90-arctan(x/4)-arctan(x/16.7)

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