Mathematics
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    arctan(tan(20)/cos(13))
    9+9*9-9/9
    exp(-1.25×2.84)
    1.0696^5
    5.8879^(-11)
    5.8879^-11
    1.1749^11
    (11243/1909.5)^-11
    (11243/1909.5)*-11
    5.3÷109.8
    3.4÷25
    14.6÷200
    0.045537×100%
    5÷109.8
    (5÷109.8)×100%
    3+4
    1-3/40-1/20
    (0.15×556.331×10^3×95×6)/(2×0.7×10×170^2 )
    (0.15×556.331×10^3)/(2×0.7×10×170)
    (0.15×556.331×10^3)/(2×0.7×10×170)

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