Hello tutor, please solve the problem 234. This problem have four part (a,b,c, and d). Please make sure that the f" is correct. Thank you so much. I would leave a good feedback and thumbs up:)

For the following exercises, determine a. intervals where f is increasing or decreasing, b. local minima and maxima of f, C. intervals where f is concave up and concave down, and d. the inflection points of f. Sketch the curve, then use a calculator to compare your answer. If you cannot determine the exact answer analytically, use a calculator. 231. [T] f(x) = sin(xx) - cos(xx) over x = [-1, 1] 232. [T] f(x) = x+ sin(2x) over x = [-