If (u = Tan^{-1} ( frac{x^3+y^3}{x+y}) ) then, (x^2 frac{ ^2 u}{ x^ – McqOptions

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1.	If (u = Tan^{-1} ( frac{x^3+y^3}{x+y}) ) then, (x^2 frac{ ^2 u}{ x^2}+y^2 frac{ ^2 u}{ y}+2xy frac{ ^2 u}{ x y} ) is?
A.	Sin(4u) Cos(2u)
B.	Sin(4u) Sin(2u)
C.	Cos(4u) Sin(2u)
D.	Cos(4u) Cos(2u)
Answer» C. Cos(4u) Sin(2u)

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