A) \[x{{\left( \frac{dy}{dx} \right)}^{2}}-x+a=0\]
B) \[\frac{{{d}^{2}}y}{d{{x}^{2}}}+xy=0\]
C) \[dy+dx=0\]
D) None of these
Correct Answer: C
Solution :
Option First order and second degree. Option Second order and first degree. Option First order and first degree. i.e., \[dy+dx=0\]or \[\frac{dy}{dx}+1=0\].
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