33966*((1+0.072254)^13-1)/(0.072254*(1+0.072254)^13)
    cos51
    5.1/140
    35932447/4093
    4347826087/121
    39130434783/9
    847134782617167/21649
    434782608695652173913/513239
    21649*513239*9*121*4093*8779
    arctan0.0076923077
    arctan0.3333333=
    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)

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