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- Prove that the function for (x,y) ∈ R2, has a local maximum, a local minimum and a saddle point.Determine two functions, defined on the interval (−∞,∞)(−∞,∞), whose Wronskian is given by W(f1,f2)=e2xW(f1,f2)=e2x. Are the functions that you found linearly independent on (−∞,∞)(−∞,∞)? How do you know?Find the linearization L(x) at x=a. 
- Find the linearization L(x) of f(x) at x=a. find the linearization L(x) of ƒ(x) at x = a. ƒ(x) = tan x, a = πParametrize the directed line segment which joins the point −2 + 3i to the point 5 − 7i, that is, find a function t → z(t), a ≤ t ≤ b such that the range of the function is the set of all points of the said line segment
- Determine two functions, defined on the interval ( − ∞ , ∞ ) , whose Wronskian is given by W ( f 1 , f 2 ) = e 2 x . Are the functions that you found linearly independent on ( − ∞ , ∞ ) ? How do you know?(The Second Derivative Test) Let f : [a, b] → R be differentiable on (a, b). Suppose c ∈ (a, b) is such that f '(c) = 0, and f ''(c) exists. (a) If f ''(c) > 0, prove that f has a local minimum at c. (b) If f ''(c) < 0, prove that f has a local maximum at c. (c) Show, using two specific examples, that no conclusion can be made if f ''(c) = 0.Use a Wronskian to determine whether the set of functions { 1, cos x, sin x } on (-inf, inf) is linearly independent or linearly dependent.