Consider the following. ft} = t + cos[t), 27r E t E 27E {a} Find the interval of increase. [Enter your answer using interval notation.) S (b) Find the local maximum values). (Enter your answers as a commaseparated list. If an answer does not exist, enter DNE.) Find the local minimum value[s]. [Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) S {c} Find the inflection points. smallest xvalue (x, y} = ( j (x. r) = ( l (x. y) = ( ) largest x-value (x, y}. = ( ) Find the intervals the function is concave up. (Enter your answer using interval notation.) E Find the intervals the function is concave down. (Enter your answer using interval notation.)