Explanation
Option (a) has order = 4, degree = 1
Option, (b) has order = 3, degree = 4
Option, (c) has order = 3, degree = 3 (taking cube)
Option, (d) has order = 1, degree = 2 (squaring)
The order of the differential equation is order of highest derivatives in the differential equation.
Order and degree of given differential equation will be 2 and 1 respectively.
Clearly degree = 1
It is obvious
Clearly degree = 1, order = 3
Order 3, degree 2
By property
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