Mathematics
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    arctan(-8)
    1/59
    ln2-1
    [1387×(1+0.0518)×1.0861×1.3612+0]×0.9853
    [1-1/(1+6.50%)^57.53]/[1-1/(1+6.50%)^70]
    (1.02)^4.17
    1.2×8×84.2×9.8/(0.85×8×sin60)
    2.5-1
    874*19
    0.73×1/2×2^2×3.05
    (495+1583.8)/(5×8.5)
    (495+1583.8)/(6.5×3)
     ½
     e
     [7,12]
     7*12
     0/0
     (√289)*(√2809)
     ((√289)+(√2809))/10
     21649*513239

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