If \[\sin A+\sin 2A=x\] and \[\cos A+\cos 2A=y,\] then \[({{x}^{2}}+{{y}^{2}})({{x}^{2}}+{{y}^{2}}-3)=\]

If \[\sin A+\sin 2A=x\] and \[\cos A+\cos 2A=y,\] then \[({{x}^{2}}+{{

1.	If \[\sin A+\sin 2A=x\] and \[\cos A+\cos 2A=y,\] then \[({{x}^{2}}+{{y}^{2}})({{x}^{2}}+{{y}^{2}}-3)=\]
A.	\[2y\]
B.	\[y\]
C.	\[3y\]
D.	None of these
Answer» B. \[y\]

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If \[\sin A+\sin 2A=x\] and \[\cos A+\cos 2A=y,\] then \[({{x}^{2}}+{{y}^{2}})({{x}^{2}}+{{y}^{2}}-3)=\]

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