Question

Need help with calculus. My teacher website is down and this is due at midnight. Problem in comments

Answer 1

you can do this without calculus, calculus only makes it worse
the biggest cosine can be is 1, the smallest is \(-1\)

Answer 2

Okay I didn't think about it that way

Answer 3

http://www.wolframalpha.com/input/?i=2 \cos%28x%29+domain+-3pi%2F2..+3pi%2F2

Answer 4

largest it can be is \(2\) if \(x=0\) and smallest is \(-2\) if \(x=\pi\) or \(-\pi\)

Answer 5

I don't want to do the derivative test right now, nor do I want to do an observation based on 2nd derivative. I might as well just give you a good graphing calculator to graph the f(x), since I am done with math for now.
https://www.desmos.com/calculator