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# Determine order and degree (if defined) of differential equation $y''+2y'+\sin y=0$

$\begin{array}{1 1}order1, degree2 \\order2, degree\;is\;not\;defined \\ order2, degree2 \\order1, degree1 \end{array}$

Toolbox:
• The highest order derivative present in the differential equation determines the order of the equation.The power to which the corresponding derivative is raised determines its degree.
Step 1:
The highest order derivative present in the differential equation is $\large\frac{d^2y}{dx^2}$.Hence its order is 2.
Step 2:
But it is not a polynomial in its derivatives,so the degree is not defined.