arcos0.356
    （0.01-x）*（0.01-x）/x^2=2.25
    （0.01-x）*（0.008-x）/x^2=2.25
    （0.01-x）*（0.012-x）/x^2=2.25
    （0.01-x）*（0.012-x）=2.25*x^2
    (x+1)(x×x-3×x+2)=0
    x^2-36x+325=0
    cosx＝-0.3
    tanx＝3.5
    sinx＝0.75
    (1+r/2)^2-1=8%
    tanx＝3
    cosx＝0.21
    sinx＝0.35
    sinx＝0.355
    tanx＝2
    sinx＝-0.4
    sinx＝-0.7
    a+0.67a=40
    -3x²+5x-4

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