Let f 0 sin 0 3 cos 0 Calculate the derivative Note to get the to show up type theta and the system will immediately convert the word to the symbol f 0 cos 0 3 sin 0 List the first interval after 0 where both endpoints of the interval are critical numbers of the function on which f is increasing Increasing List the first interval after 0 where both endpoints of the interval are critical numbers of the function on which f is decreasing Decreasing