If \[2y\,\cos \theta =x\sin \,\theta \text{ and }2x\sec \theta -y\,\text{cosec}\,\theta =3,\] then \[{{x}^{2}}+4{{y}^{2}}=\] [WB JEE 1988]

If \[2y\,\cos \theta =x\sin \,\theta \text{ and }2x\sec \theta -y\,\te

1.	If \[2y\,\cos \theta =x\sin \,\theta \text{ and }2x\sec \theta -y\,\text{cosec}\,\theta =3,\] then \[{{x}^{2}}+4{{y}^{2}}=\] [WB JEE 1988]
A.	4
B.	-4
C.	± 4
D.	None of these
Answer» B. -4

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If \[2y\,\cos \theta =x\sin \,\theta \text{ and }2x\sec \theta -y\,\text{cosec}\,\theta =3,\] then \[{{x}^{2}}+4{{y}^{2}}=\] [WB JEE 1988]

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