In Problems a to b, sketch the graph of the given function fin the region (-, ),

Question:

In Problems a to b, sketch the graph of the given function fin the region (-π, π), unless otherwise indicated, labeling all extrema (local and global) and the inflection points and showing any asymptotes. Be sure to make use of f' and f".
a. f(x) = cos x - sin x
b. f(x) = sin x - tan x