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1. Let f(x, y) : x2 cos(4y) , x = uzv3 , and y = 113 + v3 . Find :1. Your answer may contain

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1. Let f(x, y) : x2 cos(4y) , x = uzv3 , and y = 113 + v3 . Find :1. Your answer may contain x, u y, u, and/or 12. 2. Find the exact value of the directional derivative of the function g(r,s) = tan'1(rs) at the point (1,2) in the direction of the vector: (5,10)

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