Give the Amplitude or Period as Requested $y = - 2 \cos \frac { 1 } { 3 } x$

question 183

Multiple Choice

Give the amplitude or period as requested.
-Period of $y = - 2 \cos \frac { 1 } { 3 } x$

• A) \(- 2\)
• B) \(\frac { 2 \pi } { 3 }\)
• C) \(6 \pi\)
• D) \(\frac { \pi } { 3 }\)