Given:
Tan 81 degree
Required:
tan 81 degree = cot _?__
Explanation:
[tex]\begin{gathered} tan\text{ 81}\degree=cot9 \\ \\ tan(90-x)=cotx \\ \\ or\text{ we can also solve like this tan81}\degree \\ \\ cot(90\degree-81\degree)=cot9\degree \end{gathered}[/tex]Required answer:
[tex]tan81\degree=cot9\degree[/tex]