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Unformatted text preview: ~v =-2 ~ j + 2 ~ k at the point (1,1,-1). 4. (5 pts) (a) Suppose the function f ( x, y ) has continuous partial derivatives. Use the chain rule to write a formula for the derivative of the function F ( t ) = f (5 t 3 , t 2 ) . (b) If f x (5 , 1) =-2 , f y (5 , 1) = 3 , ﬁnd the derivative F (1) ....
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