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solve m*g*d/2*(1-cos(pi))=1/2*1/3*m*d^2*o^2 for o, g=9.81, m=1,d=1
solve m*g*d/2*(1-cos(pi))=1/2*1/3*m*d^2*o^2 for o, g=9.81, m=1,d=1
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