Mathematics
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    2000000*0.49*((2/2.4)^3)*sqrt(2.4/(345*3000))
    2000000*0.53*((2/2.4)^3)*sqrt(2.4/(345*3000))
    2000000*14.8*((2/2.4)^3)*sqrt(2.4/(345*3000))
    4/27
    (5/3)^3-4*(5/3)^2+5*5/3-2
    arctan0.64
    172÷319
    √131345
    219/sqrt(126922)
    -281/sqrt(126922)
    −219/sqrt(126922)
    arccos0.9=
    arccos1
    arccos0.65
    e(-1×(2-sqrt(4-1))×2×X) = 1
    600/(1+3%)+600/(1+3%)^2+30600/(1+3%)^3
    2X=93
    s/2.5=27.5%/s-1
    s^2+2.5s-0.6875=0
    tan2a=-1.03

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