MCQ
Which of the following is a second$-$order differential equation?
  • A
    $(\text{y}\ ')^2+\text{x}=\text{y}^2$
  • $\text{y}\ '\text{y}\ ''+\text{y}=\sin\text{x}$
  • C
    $\text{y}\ '''+(\text{y}\ '')^2+\text{y}=0$
  • D
    $\text{y}\ '=\text{y}^2$

Answer

Correct option: B.
$\text{y}\ '\text{y}\ ''+\text{y}=\sin\text{x}$
The order $\text{y}\ '\text{y}\ ''+\text{y}=\sin\text{x}$ of is $2.$ Thus, it is a second$-$order differential equation.

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