(a) Given a function f(x,y)= 3x’y-2axy? +a . Find the directional derivative of f(x,y) at the point (2, -1) and in the direction of v=3i -4j. (b) Given == f(x, y), x= In Vs+1, y = es+t) (i) Find ах дах ду @y and Ostos Ot a- 022 (ii) Determine +4 +4 as? Osāt 012 (c) Suppose an implicit function defined by xºy-3ay?:? +4.rº: = a, use implicit differentiation to ax find Oz
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