let = distance from foot of the ladder to the fence
find and minimize
a thief tries to enter a building by placing a ladder over a 9-ft-high fence so it rests against the building,which is 2 ft back from the fence.
what is the length f the shortest ladder and the ground? (let Q be the angle between the ladder and the ground) express the length of the ladder in terms of Q,
and then find the value of Q that minimizes the length of the ladder.