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
    33461*33461
    55*66+66*77+77*88+88*99
    cos36*cos72*cos108*cos144
    cos36+cos72+cos108+cos144
    sin0.827460584255555
    sin47.41

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