- #1
Gatsby88
- 14
- 0
Homework Statement
I have a differential equation of the form
[itex]\frac{dZ}{d\theta} + cZ = a cos \theta + b sin \theta [/itex]
Where [itex]Z = \frac{1}{2}\dot{\theta}^{2}[/itex]
I need to find the general solution of this equation. a, b and c are all constants.
Homework Equations
The questions suggests using this to help:
[itex]\int e^{\lambda x} (a cos x + bsin x ) = \frac{1}{1+\lambda^2}e^{\lambda x}(\lambda (a cos x + b sin x) a sin x - b cos x) + C[/itex]
The Attempt at a Solution
I just don't know how that integral is supposed to help me solve the equation. How does e become relevant to this function?
Im also a bit unsure about this.. If I integrate
[itex]\frac{1}{2}C \dot{\theta}^2[/itex]
with respect to θ, do I get
[itex]\frac{1}{2}C \theta ^2[/itex] ?