\sqrt{\frac{4*25*10^-3*9.81*tan^{-1}(60°)*(2*60*sin(30°))²}{9.0*10^9}}\sqrt{\frac{4*25*10^-3*9.81*tan^{-1}(60°)*(2*60*sin(30°))²}{9.0*10^9}}

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