(d) u=sin 2 coshy + cos x sinh y 3. Find the equations of the tangent plane and the normal line to the given surface at the specified point. (a) z = 3x² - y² + 2x, (1, -2,1). (b) z = e cos y, (0, 0, 1). 4. Find the total derivative of the following functions.

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A: The Expression is as follows

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A: f(x,y)=x2+5xy+y2−22x−13y+27fx(x,y)=∂∂x(x2+5xy+y2−22x−13y+27)Using the power Ruleddxxn=nxn−1

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A: (7)

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A: The given function

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Q: ܘ 34.

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A: f(x)=3x−2x2+4x at (−2,2).Quotient Ruleddx[f(x)g(x)]=g(x)f′(x)−f(x)g′(x)[g(x)]2

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