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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

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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

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1 Answer

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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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