(Part I) Problem 1: Graphing a bivariate function and its second order approximationUse R to graph a 3–d plot of the function π(π₯1, π₯2) = cosβ‘(π₯1π₯2) and its second order Taylor approximationβ(π₯1, π₯2) = 1 β π28 π₯1 2. Following are the requirements: i. [1 pt] Write an R function that produces the function π. […]