Question

express cosecA in terms of other trogonometric ratios

Answer 1

$$\begin{gathered} \cos ecA=\frac{1}{\sin A}=\frac{1+{\tan }^2{\displaystyle \frac{A}{2}}}{2\tan {\displaystyle \frac{A}{2}}} \\ =\frac{1}{\sqrt{1-{\cos }^{2}A}} \end{gathered}$$