Mathematics
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    (4/7)/(3/5)
    (4:7)÷(3:5)
    (4÷7)÷(3÷5)
    (4/7)÷(3/5)
    sin1/cos1
    arctan-2/3
    1/2arctan(-4)
    1/2arctan(8)
    1/2arctan(8)
    30.6×0.69×0.5
    46×0.69×0.5
    25.5×0.69×0.5
    11.7×0.69×0.5
    47×0.69×0.5
    27×0.69×0.5
    18×0.68×0.5
    (114514+114514)*(11451+4+(11*(4+5)*14-11+45-1-4))+(11*4514+(114*5*14+(11*4*(5+14)-11+4-5+14)))
    720÷(90÷7)
    720÷(90÷7)
    e

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