Without graphing the function, determine its amplitude or period as requested.
-$y = - 3 \cos x \quad$ Find the period.
A) $\pi$
B) $\frac { \pi } { 3 }$
C) $2 \pi$
D) 3

Question

Quizplus · Accepted Answer

The period of a cosine function in the form $y = a \cos(bx)$ is given by $\frac{2\pi}{|b|}$. For $y = -3 \cos x$, $b = 1$, so the period is $\frac{2\pi}{1} = 2\pi$.

Without Graphing the Function, Determine Its Amplitude or Period as Requested