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If w(x, y, z) = x^2(y – z) + y^2(z – x) + z^2(x – y), then ∂w/∂x + ∂w/∂y + ∂w/∂z is ... (a) xy + yz + zx (b) x(y + z) (c) y(z + x)

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If w(x, y, z) = x2(y – z) + y2(z – x) + z2(x – y), then ∂w/∂x + ∂w/∂y + ∂w/∂z is ...

(a) xy + yz + zx 

(b) x(y + z) 

(c) y(z + x) 

(d) 0

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Answer is (d) 0

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