# Calculus

posted by
**Cynthia** on
.

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=