Question

The \(x\)-coordinates of the points on the graph of

\(f (x) = x + 2 \cos (x)\)

in the interval \([0, \pi]\) at which the tangent line is horizontal are (in increasing order)

\(x =\)? and \(x =\)?

Answer 1

explain

Answer 2

Here's kinda what the graph looks like. How do you find where the tangent line is horizontal?