arctan16.95x+arctanx+arctan0.25x+arctan143.64x=90
    arctan16.95x+arctanx+arctan0.25x+arctan143.64x=1.57
    arctan16.95x+arctanx+arctan0.25x+arctan143.64x=90
    arctan16.95x+arctanx+arctan0.25x+arctan143.64x=90
    arctan16.95x+arctanx+arctan0.25x+arctan143.64x=1.57
    arctan2*x=90
    arctan(2*x)=90
    arctan(2x)=90
    arctan2x=90
    arctan2x=1.57
    arctan2x=90
    X+（X*5%）=741518
    X+（X*5%）=729698
    arctan0.12x+arctan0.02x=90
    x+0.214x＝2.4
    x+0.068x＝2.2
    arctan(x)+arctan(1/4x)=90
    x+0.108x＝6.1
    450-30x=400-20x
    12x-x²=3/0.459

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