ASSIGNMENT #1
Classify the order, degree, and linearity of the following DE.
1. $f'''(x) + 3t^3f''(x) = \cos 5t$
2. $y''' + 3x^2y'' + \ln y' = 0$
3. $f(x)f''(x) + f'(x) = 0$
4. $y''' + yy'' + 2y^2 + \sin(y'') + e^ty = 0$
5. $3x^2y'' + 2\ln(x)y' + e^xy = 3x \cos x$
6. $4yy''' - x^3y' + \cos y = e^{2x}$
7. $y'' - y\frac{dy}{dx} = \cos x$