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in Differentials and Partial Derivatives by (49.1k points)
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If M = y sin x, then ∂2u/∂x∂y is equal to ... 

(a) cos x 

(b) cos y 

(c) sin x 

(d) 0

1 Answer

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by (46.9k points)
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Best answer

(a) cos x

u = y sin x

∂u/∂y = sin x 

2u/∂x∂y = cos x 

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