Mathematics
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    √5-1
    -1√5
    √5
    625987000*19500^2
    625987000*380250000/5.6*10^15
    5.6*10^15:(41.41/1678.87)^2+(1-(41.41/1678.87)^2)*5.6*10^15/1678.87
    5.6*10^15:(41.41/1678.87)^2+(1-(41.41/1678.87)^2)*5.6*10^15/1678.87
    esin(-3)
    sin(60-51.5)
    sin(60-51.5)
    C(13,4)
    1/2*1600*123.26^2-(0.5*1400*(123.26-175)^2)
    2*1.03*10^7
    1/2*1600*123.26^2-(0.5*1400*(123.26-175)^2)
    1/12*200*1500^3+200*1500*(750-200)^2+1/12*1400*175*(200-87.5)^2+5.667*6154*(1402.6-200)^2
    0.5*1500^2+0.5*(1600-200)*175^2+5.667*6154*1402.6
    1600*(253.62^3)/3-1400*78.62^3+6.667*6154*(1402.6-253.62)^2
    200*1500+1400*175+5.667*6154
    200*1500*1400*175+5.667*6154
    C(15,6)

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