Please help me this physic question?

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 μ1 = 0.135 and the coefficient of friction between the ladder and the wall is μ2 = 0.253. Determine the maximum angle with the vertical the ladder can make without falling on the ground.

Comments on "Please help me this physic question?"
More: Vector field F=h(||r||))r, r=(x,y,z) and h=any differentiable function.? An object of uniform density floats on water with three-fourts of its volume submerged. Its specific weight is? Which one of the following types of balance is less restrictive and more dynamic than the others? PHYSICS HELP!!! Two draft horses, Sam and Bob, are dragging a sled loaded with jugs of maple syrup.? For the differential equation: 2xy''-y'+2y = 0?