Consider the function $$y = \cos 3 x$$ . Specify the period.
A) $$\frac { \pi } { 3 }$$
B) $$\frac { 2 \pi } { 3 }$$
C) $$\frac { 6 \pi } { 7 }$$
D) $$2 \pi$$
E) $$- \frac { 2 \pi } { 3 }$$

Question

Quizplus · Accepted Answer

For $y=\cos 3x$, note that the argument of cosine is $3x$, which means the period of the function is $\frac{2\pi}{	ext{coefficient of }x}=\frac{2\pi}{3}$. Therefore, the correct choice is $\boxed{	extbf{(B)}\ \frac{2\pi}{3}}$.

Consider the Function y=cos⁡3xy = \cos 3 xy=cos3x Specify the Period

Consider the Function $y = \cos 3 x$ Specify the Period