Question

The derivative $\frac{\mathrm dy}{\mathrm d x}$ ,if $x=a(\theta -sin\theta),y=a(1+cos\theta)$ is :

• A. $cos \frac{\theta}{2}$
• B. $-cot \frac{\theta}{2}$
• C. $cot \frac{\theta}{2}$
• D. $tan \frac{\theta}{2}$

Answer 1

Answer: (B)

$-cot \frac{\theta}{2}$

Answer 2

The correct option is (B): $-cot \frac{\theta}{2}$