Mathematics
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    71*12.19/7.93=
    70.85*12.19/7.93=
    70.85*12.1/7.93=
    70.85*12.19/7.988=
    70.85*12.19/8=
    70.85*12.19/7.96=
    sin20*sin40*sqrt3/4
    sin20*sin40
    18%*0.6+13%*0.6
    15%*10*16.67%/(1-15%*10*16.67%)
    [3/7+0.5*(-2/3)]*(-21/5)
    2.75-[-0.5+(5/6)-(0.125-14/3)]
    -3^3/(12/5)-(-2)^2*4
    -(-2/3)^2
    280/(1+12%)+302.4/(1+12%)^2+317.52/10%/(1+12%)^2
    288.5/(1+12%)+317.35/(1+12%)^2+346.97/10%/(1+12%)^2
    1163.5*0.5439
    40*7.1078+1163.5*0.6446
    40*6.8017+1163.5*0.5919
    15*(1+5%)^9*(1000/20)

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