I have to solve the following D.E. which describes how the amplitude of oscillation r, changes with time.(adsbygoogle = window.adsbygoogle || []).push({});

[tex]r=f(t)[/tex]

[tex]\frac{dr^{2}cos^{2}t}{dt}=rsint[/tex]

How do I find r?

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# Simple harmonic motion and damping

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