Graph of the Following Curve Is Given $$r = 6 \cos ^ { 2 } \left( \frac { \theta } { 2 } \right)$$

Multiple Choice

Graph of the following curve is given. Find its length. $$r = 6 \cos ^ { 2 } \left( \frac { \theta } { 2 } \right)$$

A) L = 25
B) L = 24
C) L = 26
D) L = 32
E) L = 20