Chapter 1 - Functions and Limits - Review - Exercises - Page 96: 8

Domain$= (-\infty,\infty)$ Range= $[2,4]$

The cosine is defined for all reals, so Domain = $\mathbb{R}= (-\infty,\infty)$ Range: Minimum of cosine is $-1$, so the minimum of F is $3-1=2$ Maximum of cosine is $+1$, so the minimum of F is $3+1=4$ Range= $[2,4]$