Mathematics
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    9÷(2/3)
    9÷2/3
    log(0.5,0.33)
    9÷1
    cos 25
    sin 155
    4-4
    {[(9.5+9+8)/2]+[3(8.5+7)]/10}/[(5-7)2+2]
    (2*6.5*7.5)/(6.5+7.5)
    8lg2
    2lg8
    lg8
    lg10
    !(7)
    4700000^(3/4)/20^(3/4)
    4700000^(3/4)
    -(1/25)(2.5)^2+4
    26*16700-62874-10400*18.96
    25*16700-62874-10400*18.96
    ln3

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