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Find f, and f, and evaluate each at the given point. f(x, y) = arctan (4, -4) X x ( X, y ) = X

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Find f, and f, and evaluate each at the given point. f(x, y) = arctan (4, -4) X x ( X, y ) = X f ( x, y ) = f ( 4, - 4 ) = XXX fu( 4, - 4) =

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