(559,#25) a) Find the slope of the tangent line to the trochoid
in terms of . b) Show that if r>d>0, then the trochoid doesn't have a vertical tangent.

Solution: a)

b) Suppose there is a vertical tangent. Then

But, if r>d>0 then = r/d > 1, a contradiction has been reached. So there is no vertical tangent.

by:sh