Posted by **Cynthia** on Friday, June 1, 2012 at 9:55pm.

Use the given equation to answer the following questions. (Enter your answers from smallest to largest.)

r = 8cos(¦È)

0 ¡Ü ¦È < ¦Ð

(a) Find the points on the given curve where the tangent line is horizontal.

theta=

theta=

(b) Find the points on the given curve where the tangent line is vertical.

theta=

theta=

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