Mathematics
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    arctan(2)
    arctan(-5/12)
    (lg25)^2+4lg25+4
    (ln5+5)^2
    (5^2-lg2-lg5-lne+lg100)
    (5^2-lg2-lg5-lne+ln2)lg100
    (5^2-lg2-lg5-lne+ln2e)lg100
    5^2-lg2
    5^2-lg5+lg2+lne
    ln1.01-ln0.99
    ln1.01
    ln101-ln99
    ln(101)
    tan(arccos0.6)
    89+233*10+6*30+17*50
    1738ln(11/11)+11^3-11-6 1738/11+3*11^2-1
    1/12 加 1/20 加 1/30 加1/42 加1/56 加1/72 加1/90
    1653-30+3.5+5+4.5+4
    1653-12+5+4
    1653-12+2.5+2

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