a) Find and classify the ciitical points off x, y = 3×3 +93;2 72x+ 2y3 12y2 -126y+19′ (b) The function f 15 defined by f (x y)- = sin(y- x)+e ln(x2…

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(a) Find and classify the ciitical points off x, y = 3×3 +93;2 —72x+ 2y3 —12y2 -126y+19′ (b) The function f 15 defined by f (x y)- = sin(y- x)+e ln(x2 +2). Find 3f, 3—16, 2—2 2f and
x y 3’2
6‘ _f2 a a for function f. (Note: Show your working clearly.)
y x

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