• $\mathit{s}\mathit{i}\mathit{n}\mathit{\theta }\cot \mathit{\theta }=\cos \mathit{\theta }$
  
• $\cos \mathit{\theta }\tan \mathit{\theta }=\mathit{s}\mathit{i}\mathit{n}\mathit{\theta }$
  
• ${\mathrm{cosec}}^2\mathit{\theta }-{\cot }^2\mathit{\theta }=1$
  
• ${\tan }^2\mathit{\theta }-\mathrm{}\mathit{s}\mathit{e}{\mathit{c}}^2\mathit{\theta }=1$