arccos0.959
    arccos140/146
     tan(arccos0.74)-tan(arccos0.92)
    tan(arccos0.736)-tan(arccos0.92)
    tan(arccos0.853)-tan(arccos0.92)
    4*4/4
    tan(arccos0.804)-tan(arccos0.92)
    arccos0.866
     tan(arccos0.85)-tan(arccos0.92)
    tan(arccos0.804)-tan(arccos0.92)
    tan0.0002=
    3640000/(0.98×30460)
    235702260395*471404520791
    √(32959081)
    √(32959081*2)
    √131836323
    114243/80782
    665857/470832
    275807/195025
    114243/80782

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