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Q3. VX- a) If u = sin 1 show that y du du X- +yay 0. b) If z = = cosy ,x= u' -

Q3. VX- a) If u = sin 1 show that y du du X- +yay 0. b) If z = = cosy ,x= u' - v,y = e*, find az av c) Find the extrema of f(x, y) = cos x + cosy

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