## Algebra and Trigonometry 10th Edition

We know that the sine and cosine functions are given in the form $y=acos(bx)$ and $y=asin(bx)$. In both equations, $a$ is the amplitude, and $\frac{2\pi}{b}$ is the period. Knowing this, we see that for the given function, amplitude will stay the same and period decreases by a factor of 5.