The differential equation of the family of curves \[y=a\cos (x+b)\] is

1.	The differential equation of the family of curves \[y=a\cos (x+b)\] is [MP PET 1993]
A.	\[\frac{{{d}^{2}}y}{d{{x}^{2}}}-y=0\]
B.	\[\frac{{{d}^{2}}y}{d{{x}^{2}}}+y=0\]
C.	\[\frac{{{d}^{2}}y}{d{{x}^{2}}}+2y=0\]
D.	None of these
Answer» C. \[\frac{{{d}^{2}}y}{d{{x}^{2}}}+2y=0\]

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The differential equation of the family of curves \[y=a\cos (x+b)\] is [MP PET 1993]

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