!(40)
    !(30)
    !(50)
    !(70)
    !(√2)
    !(√2)
    !(0.5)
    !(100)
    !(-2)
    !(-1)
    !(20)
    !(10)
    !(7)
    ln0.2
    ln20
    2*sec(－π/4)*sec(－π/4)*cos(－π/4)
    2*sec(－π/4)*sec(－π/4)*cos(－π/4)
    -lg(2.2*10^-13)
    lg(2.2*10^-13)
    lg(2.2*10^-3)

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