Consider the following function f(a:) = 8sin(a:) +3cos(a:), 0

Consider the following function f@) = 8sin@) + 3 cos c (a) Does c = 4 belong to an interval on which f is increasing or decreasing? Increasing O Decreasing (b) Determine the c-values for which f has an absolute minimum and absolute maximum. Enter numeric values correct to 2 decimal places. absolute minimum: c = absolute maximum c = Number Number (c) Determine the interval on which f is concave up. Enter numeric values correct to 2 decimal places. Number Number