Use the second derivative test to find the location of all local extrema in the interval (0, 2π) for the function given below: f(x) = 1 - 5sin(x). If there is more than one local maximum or local minimum, write each value of x separated by a comma. If a local maximum or local minimum does not occur on the function, enter ∅ in the appropriate box. Enter the answer using the exact value.