sinx+0.1*cosx=0.0914
    sinx+0.1*cosx=0.0914
    sinx+0.1*cosx=0.00711
    sin2a+0.4π-2a=0
    sin2a+1.256-2a=0
    x-(x/1.01*0.01)-(x/1.01*0.01*0.07/2)-{x-(x/1.01*0.01)-(x/1.01*0.01*0.07/2)}*0.16=13500
    0.4x+x*x=0.00408-0.0102x
    arctan(0.1x)+arctan(0.2x)+arctan(49x)-arctan(4.07x)=0.5π
    x^2+4220x-72463=0
    x^2+4220x-36231=0
    0.62*0.59*2.53*x=3
    x*0.77*2.49*2.48=3.3
    3X^2-2X=6
    (3X^2-4X+3):2X-1
    90723=90723/（1+x）×（1+x）
    arctan(0.1x)+arctan(0.2x)+arctan(16.4x)-arctan(4.07x)=0.5π
    arctan(x)+arctan(3x)=270
    arctan(x)+arctan(3x)=270
    arctan(x)+arctan(3x)=270
    10lgx＝5

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