Let z = f(x,y) = 6x - 9xy + 4y. Find the following using the formal definition of the partial derivative. dz of dz b. c. dx :(-1,4) d. f,(2,1) а. dx ду

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A: y=(8x4-5x2+8)4 d dx(xn)=nxn-1ddx(constant)=0

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A: To determine the derivative of the function.

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A: even symmetric means it satisfies x(t)= x(-t) while odd symmetric means it satisfies x(-t)= -x(t)

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