Find the inection points of y = ~./ sin(x} + cos(x), 0 s x s 271'. (Use symbolic notation and fractions where needed. Give your answer as a comma separated list of points in form (I: , 3:). Enter DNE if inection points do not exist.) Let x) = m: 5)6 + 50: 3". Find the local extrema of f. [Use symbolic notation and fractions where needed. Give your answer in the form of a comma-separated list of point coordinates in the form (*, *). Enter DNE if the function has no local extrema.) Determine the intervals on which f is concave up and on which it is concave down. (Use symbolic notation and fractions where needed. Give your answers as intervals in the form (*, er). Use the symbol Go for innity. U for combining intervals. and parenthesis "(", "}" for open intervals. Enter 13 if the interval is empty.) Find any points of inection. (Use symbolic notation and fractions where needed. Give your answer in the form of a comma-separated list of point coordinates in the form (*, *). Enter DNE if the function has no points of inection.)