QuestionFind the amplitude and period for $-3 \cos (2 x)$.

Studdy Solution
Identify the period of the function $-3 \cos(2x)$.
The period of a cosine function $a \cos(bx)$ is calculated using the formula:
$$\text{Period} = \frac{2\pi}{b}$$
In this case, $b = 2$.
$$\text{Period} = \frac{2\pi}{2} = \pi$$
The amplitude is $\boxed{3}$ and the period is $\boxed{\pi}$.