Let f(0) = sin(0) + 1 cos(0). 3 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) = 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: