Consider The Following. W = Yz/X, X = Θ2, Y = R + 7θ, Z = R − 7θ (A) Find ∂W/∂R And ∂W/∂Θ By Using The Appropriate Chain
1) Consider the following.
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w = yz/x, x = θ^{2}, y = r + 7θ, z = r − 7θ
(a) Find ∂w/∂r and ∂w/∂θ by using the appropriate Chain Rule.

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(b) Find ∂w/∂r and ∂w/∂θ by converting w to a function of r and θ before differentiating.

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2) Evaluate f_{x}, f_{y} and f_{z} at the given point.
f(x, y, z) = x^{2}y^{3} + 7xyz − 5yz, (−1, 2, 1)
f_{x}(−1, 2, 1)  = 
f_{y}(−1, 2, 1)  = 
3) For f(x, y), find all values of x and y such that f_{x}(x, y) = 0 and f_{y}(x, y) = 0 simultaneously.
f(x, y) = x^{2} + 4xy + y^{2} − 18x − 12y + 14
(x, y) =
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