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If (x + y)^3 - (x - y)^3 - 6y(x^2 - y^2) =ky^2 then k = A. 1 

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If (x + y)3 - (x - y)3 - 6y(x2 - y2) =ky2 then k =

A. 1 

B. 2 

C. 4 

D. 8

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We have,

\(=(\text{x}+\text{y})^{3}-(\text{x}-\text{y})^{3}-6\text{y}(\text{x}^{2}-\text{y})=\text{ky}^{3}\)

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