Mathematics
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    265.54×3.392-2×250×1.842
    4^998*3^875/6^521
    4^3*3^4/6^5
    4 + 3(10)=
    tan(810)
    tan(-810)
    56+12
    arccos1/2
    arccos1/99
    1.2*4957.43+1.4*3263.71+1.2*(15.7*0.679-0.5*6.28*180*0.679)
    arccos-80.0210641
    exp-191.023
    7990+2500
    12*240+20*30+75*10+6*60*6+600+1000
    (0.000057/3.49)/(1/12425)
    (-0.045/3.49)/(1/24.78)
    (2907.9×10^3×422.8-1.0×14.3×600×565^2×0.608×(1-0.5×0.605))/(300×(565-35) )
    (2907.9×10^3-0.518×1.0×14.3×600×565)/((2907.9×10^3×422.8-0.43×1.1×14.3×600×565^2)/((0.8-0.518)×(565-35) )+1.0×14.3×600×565) +0.518
    157.8+600/2-35
    (400.8×10^3)/2907.9

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