A(28.115,11) B(0,0)
    9090909091/11
    100000000001/11
    51323900000513239/513239
    1111111111111111111111/21649
    （7-4）*√6
    7-4*√6
    12-2√6
    (-1 + √6)² - 2(-1 - √6) + (-1 + √6)(-1 - √6)
     arctan0.0714285
     arctan1/14
     arctan(1/14）
     arctan1
    arctan1/14
    900900990991/17
    900900990991/19
    900900990991/239
    900900990991/3451
    900900990991/79
    900900990991/53

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