Mathematics
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    arctan(0.46/15)
    arctan(0.46/5)
    arctan(0.46/5)
    arctan(0.46/5)
    arctan(2.5/1.5)
    arctan(1.5)
    arctan(1/3)
    arctan(0.46/5)
    arctan(0.46/5)
    arctan100
    arccos(-17/18)
    (2×4×8×1.6×3.2)×(5×2.5×1.25×6.25×3.125)
    9+9.9+9.99+9.999+9.9999+9.99999+9.999999 (18.5÷20.16)×(8.96÷24.8)÷(3.7÷0.124)
    10^3/10^6
    1—102.5%
    1—102.5
    1—11
    1+2
    arccos 0.13245
    3*56/(3*56+4*16)

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