Chapter 6.3, Problem 1E

If a function $f$ is periodic with period $p$, then $f\left(t+p\right)=\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ for every $t$. The trigonometric function $y=\sin x$ and $y=\cos x$ are periodic, with period _____________ and amplitude________________. Sketch a graph of each function on the interval $\left[0, 2\pi \right]$.