1+1
    (!(5))/(!(3)*!(2))
    C(3,5)
    C(3,5)
    !(114514)
    A(114514,2)
    A(114514,54188)
    A(1,2)
    log(3,27)
    abs(114514)
    abs(-3)
    1-(-√2÷2)^2
    (-√2÷2)^2
    -√[1-(-√2÷2)^2]
    -√2÷2
    -√[1-(-√2/2)^2]
    (-√2÷2)^2
    -√2÷2
    -√2/2
    lg3+abs3

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