π÷0.78÷sqrt（3）*2
    sin0.653961
    arctan0.766473
    2.407946/π
    sin1.177177
    arctan2.407946
    ln0.09
    sin0.785398
    sin0.033524
    arctan0.033537
    ln0.9÷π
    1 - (22/23) * (21/22) * (20/21) * (19/20) * (16/19) * (15/16) * (14/15) * (13/14)
    (22/23) * (21/22) * (20/21) * (19/20) * (16/19) * (15/16) * (14/15) * (13/14)
    sqrt(0.8)
    sqrt(0.175)
    sqrt(0.7)
    ((1 - 2.1)^2 + (3 - 2.1)^2 + (3 - 2.1)^2 + (2 - 2.1)^2 + (1.5 - 2.1)^2) / (5 - 1)
    (1 + 3 + 3 + 2 + 1.5) / 5
    14.5/5
    (2 + 1 + 3 + 3 + 4.5) / 5

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