Answer Happy

A. Find the 𝑥𝑥-values where 𝑓 has horizontal tangent linesin the interval [0,2π]B. Identify the interval(s) where 𝑓 is concave down.C. Where is 𝑓 increasing most rapidly? Evaluate 𝑓′ at that𝑥 -value.
9. Let f(x)=x−cosx.10 pts. A. Find the x-values where f has horizontal tangent lines in the interval [0,2π] B. Identify the interval(s) where f is concave down. C. Where is f increasing most rapidly? Evaluate f′ at that x-value.