Please show how you solve these two problems for vector calculus. Please do number 5 AND 6 PART A AND B :) refrences: Multivariable Calculus; 6th edition; McCallum, Hughes-Hallett, Gleason, et al.; Wiley.

5. Find all the second order partial derivatives of f (x, y) = sin(x/ y) . Assume that the variables are restricted to a domain on which the function is defined.6. Find the quadratic Taylor polynomial for the following functions. a.f(x, y) = 111(1 +3:2 y) about (0, 0). b. f(x,y) = "Bxy about (2, 5)