polar curve

*To*: mathgroup at smc.vnet.net*Subject*: [mg32330] polar curve*From*: TeKkEnXpErT at aol.com*Date*: Tue, 15 Jan 2002 02:30:07 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

A polar curve defined by the equation r = 4cos(theta) -pie/2<=theta<=pie/2 Parametrize the curve by x(theta), y(theta). Find the points (x,y) on this curve at which x'(theta)=0. What can you say about the tangent at these points?