How to sketch trigonometric functions?

Question

I was given this as an assignment in Calculus for Life Sciences and I really would like to figure it out:

sketch:

y=sinx, y=cosx, y=tanx over

-2x≤x≤2x

Answer 1

If you are familiar with the graphs of $\sin x$ and $\cos x,$ and you know that $\tan x=\dfrac{\sin x}{\cos x},$ then you will notice that $\tan x$ has vertical asymptotes where $\cos{x}$ has $x-$intercepts and $x-$ intercepts where $\sin{x}$ has $x-$intercepts.

Answer 2

I'm also confused about the interval you have been given. But if you want to know how to sketch trigonometric functions, this page might be of some help: http://cims.nyu.edu/~kiryl/Precalculus/Section_5.3-Trigonometric%20Graphs/Trigonometric%20Graphs.pdf