Mark against the correct answer in the following:
Question:

Mark $(\sqrt{)}$ against the correct answer in the following:

If $\mathrm{x}=\theta(\cos \theta+\sin \theta)$ and $\mathrm{y}=\mathrm{a}(\sin \theta-\theta \cos \theta)$ then $\frac{\mathrm{dy}}{\mathrm{dx}}=?$

A. $\cot \theta$

B. $\tan \theta$

C. $a \cot \theta$

D. $a \tan \theta$

Solution: