- #1

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## Main Question or Discussion Point

This is a bit weird, both are functions of theta (and time) ... so I assume the operator is on both ... is it a case of applying the product rule?

[tex]

\frac{\delta}{\delta \theta}(\dot{\theta} cos\theta)

[/tex]

[tex]

\frac{\delta}{\delta \theta}(\dot{\theta} cos\theta)

[/tex]