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Please write down the details of reasons for your solutions. Thanks. Questions 2 a) Let f(x,y)...

Please write down the details of reasons for your solutions. Thanks.

Questions 2

a) Let f(x,y) = sin (y^2 + e^(2x)). Find f(xy) and f(yx) and verify their equality.

b) Find the equation of the tangent plane to the surface z=e^(2x)*cos(3y) at P (0, pi/3, -1)

c) Find the direction in which the function f(x,y) = ((x-2y)/(2x+y))^(1/3) increases most rapidly at (1,0).

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