Mathematics
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    2809.45/8.41+68.51×6/(2.9×3.9×3.9)=
    276.73+35.2×6/(2.9×3.9×3.9)=
    (20×1.475×8.41+2079.24)/8.41=
    sin(20)
    {3+4,5+3}
    2sin3.14-3*3.14
    C(10^15,10^4)
    sin(3.14*0.43)
    sin(3.14*0.21)
    sin(3.14*0.52)
    608/128
    256/128
    e^(-19.39)
    (4*e^(-0.1*0.25))+(4*e^(-0.105*0.75))+(104*e^(-0.11*1.25))=
    4*e
    √973459/√1998
    90+arctan(0.36*4.4)-arctan(4.4)-arctan(0.12*4.4)
    90+arctan(15.15*0.57)-arctan(0.57)-arctan(0.25*0.57)-arctan(114.78*0.57)
    90+arctan(15.15*0.57)-arctan(0.57)arctan(0.25*0.57)-arctan(114.78*0.57)
    lg999

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