QUESTION 4 Let f (x) = (x+ 2) 2/3. Find all points of absolute minima and maxima on the interval [-4, - 2]. As your answer input the sum of the values of f at all points the absolute minima and maxima occure in the given interval. Your answer need to be in the decimal form with three significant digits after decimal point. QUESTION 5 Let f(a) = 3 - 2 tan-1 a . Find all points of absolute minima and maxima on the interval [0, 4). As your answer input the sum of the values of f at all points the absolute minima and maxima occure in the given interval. Your answer need to be in the decimal form with three significant digits after decimal point. QUESTION 6 Let f (a) = sin (a) + cos? (a) . Find all points of absolute minima and maxima on the interval [0, 7] . As your answer input the sum of the values of f at all points the absolute minima and maxima occure in the given interval