The value of following is : . cosec . . ^2 + co s^2 ?

Answer: Option D

$$\begin{array}{rl}& =\frac{\sin \theta .\mathrm{cosec}\theta .\tan \theta .\cot \theta }{{\sin }^2\theta +\text{co}{\text{s}}^2\theta }\\ & =\frac{\sin \theta \times \frac{1}{\sin \theta }\times \tan \theta \times \frac{1}{\tan \theta }}{1}\\ & =1\end{array}$$