Mathematics
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    (582.15×1000×725134)/(193498783×2×12)
    (87.3×1000×1000)/787124
    (87.3×1000×1000)/1665651
    (2.4×3×186.8)/((2.4+2×2.5×0.577)×(3+2×2.5×0.577 )
    (2.4×3×186.8)/((2.4+2×2×0.577)×(3+2×2×0.577 )
    (1165+3×2.4×1×25)/(3×2.4)
    2.4×3
    arctan3.1847
    arctan1.2739
    arctan2739
    arctan3.18471
    arctan3.1831
    1.62×(25×2.6+40×1.0+80×5.3)
    [1748×(1+0.062)×1.1566×1.0439+0]×0.9932
    [1-1/(1+8.0%)^58.18]/[1-1/(1+8.0%)^70]
    tan10.2
    sin45
    sin45
    tan10.2
    47➗34

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