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A ladder is leaning against a vertical wall, and both ends of the ladder are at...

A ladder is leaning against a vertical wall, and both ends of the ladder are at the point of slipping. The coefficient of friction between the ladder and the horizontal surface is ?1 = 0.115 and the coefficient of friction between the ladder and the wall is ?2 = 0.153. Determine the maximum angle with the vertical the ladder can make without falling on the ground.

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