A) \[yy''-2\,\,{{(y')}^{2}}+1=0\]
B) \[yy''+{{(y')}^{2}}+1=0\]
C) \[yy''+{{(y')}^{2}}-1=0\]
D) \[yy''+2\,\,{{(y')}^{2}}+1=0\]
E) None of these
Correct Answer: B
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