Question
$\cfrac{{{d^2}y}}{{d{x^2}}} = \cos 3x + \sin 3x$
$\cfrac{{{d^2}y}}{{d{x^2}}} = \cos 3x + \sin 3x$
.: The highest order derivative is $\cfrac{{{d^2}y}}{{d{x^2}}}$
and degree of its highest order is 1.
Therefore,
the given differential equation is of order 2 and degree 1.
NCERT & Exemplar solution for CBSE Class 12 Mathematics, Differential Equations. Curated by Sachin Sharma. Free for all students.