Mathematics
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    (755*2.2+1200)/(1.3/1.36-1.3/0.5)*25
    arctan(2π÷10)
    arctan(π÷10)
    arctan(π÷10)
    755*2.2
    755*2.2/(1.3/1.36-1.3/0.5)*1.4+1200/(1.3/1.36-1.3/0.5)*1.4
    arctan(π÷5)
    arctan(π÷5)
    [2046×(1+0.0518)×1.0805×1.1735+0]×0.9817
    [1-1/(1+6.50%)^55.56]/[1-1/(1+6.50%)^70]
    1.02^3.91
    1.960784/0.6
    23858.823529/0.6
    1/0.51
    12168/0.51
    (150+600)/(150+600+700)
    (200+800)/(200+800+900)
    (150+600+700)/(150+600)
    ln0.85
    —ln(sin1)

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