Mathematics
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    arcsin(0.25sin180)
    sin31^2+cos31^2
    arcsin(0.25sin0)
    13A(5,3)C(2,1)/3-13/3A(5,3)C(2,1)
    13A(5,3)C(2,1)/3
    13/3A(5,3)C(2,1)
    1/tan90
    log(tan90,sin90)
    ln!(20)
    lnC(20,9)
    A(tan90,3)
    128√e980
    2280.63894556^2
    A(-4,3)
    【0.05sin(3π/4)+0.06sin(π/4)】/【0.05cos(3π/4)-0.06cos(π/4)】
    sin(3π/4)
    (0.05+0.06)/(0.06-0.05)
    (0.05+0.06)/0.06-0.05
    arctan2.5
    arctan11

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