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:
