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(y*(2+1*y))^(5/3)/((2+2*y*sqrt(1+1**2))^(2/3))*0.002/0.015 = 21
(y*(2+1*y))^(5/3)/((2+2*y*sqrt(1+1**2))^(2/3))*0.002/0.015 = 21
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