Finding Concavity and Points of Inflection Graphically

Concave: $[0,\pi]$

Concave: $[\pi,2\pi]$

Concave: $[2\pi,3\pi]$

Convex: $[0,\pi]$

Convex: $[\pi,2\pi]$

Convex: $[2\pi,3\pi]$