20.5/2 *(1.7/2)*((sqrt(9.8/(1.7/2)))^2 sin^2(x))-20.5*9.8*1.7/2*(1+cos(x))20.5/2 *(1.7/2)*((sqrt(9.8/(1.7/2)))^2 sin^2(x))-20.5*9.8*1.7/2*(1+cos(x))

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