1.

The differential equation satisfied by the family of curves \[y=ax\cos \,\left( \frac{1}{x}+b \right)\], where a, b are parameters, is [MP PET 2003]

A.                 \[{{x}^{2}}{{y}_{2}}+y=0\]         
B.                 \[{{x}^{4}}{{y}_{2}}+y=0\]
C.                 \[x{{y}_{2}}-y=0\]             
D.                 \[{{x}^{4}}{{y}_{2}}-y=0\]
Answer» C.                 \[x{{y}_{2}}-y=0\]             


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