Mathematics
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    -arctan(1/e)+π/4
    -arctan(1/e)+π/4
    -arctane^(-1)+π/4
    -arctane^1+π/4
    π/4-arctane^1
    √448
    16^2-4*(-48)
    -5+9
    16/15+162.5%
    16/15+162.5/100=
    64÷3
    (1+4%)²-1
    64÷3
    64÷3
    64÷5
    70÷5
    √15
    1496*0.9*0.8-536*(0.9-0.3)*2-325=
    1496*0.8*0.8-536*(0.8-0.3)*2-325=
    1496*0.8*0.8-536*(0.8-0.3)*2=

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