derivative of log (tan t/2)?
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so derivative is
![\frac{sec^2(t/2)}{2tan(t/2)} \frac{sec^2(t/2)}{2tan(t/2)}](https://tex.z-dn.net/?f=+%5Cfrac%7Bsec%5E2%28t%2F2%29%7D%7B2tan%28t%2F2%29%7D)
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