Answers: 2
![= a[\dfrac{d(\cos t)}{dt} + \dfrac{d(\log\tan \dfrac{t}2)}{dt}]](/tpl/images/1011/4754/339d7.png)
![= a[ -\sin t + \dfrac{1}{\tan \dfrac{t}2 }\times sec^2\dfrac{t}2\times \dfrac12]](/tpl/images/1011/4754/1abfe.png)
![= a [ -\sin t + \dfrac12 \dfrac{1}{\sin \dfrac{t}2\cdot\cos \dfrac{t}2 }]](/tpl/images/1011/4754/3a5f1.png)
![= a [ -\sin t + \dfrac1{\sin t}]](/tpl/images/1011/4754/4ae45.png)
[from (1) and (2)] 
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