Trigonometric Identities, Continued

$$\begin{eqnarray*} \mr {\sin(A)-\sin(B)}{2\cos\left(\frac{A+B}{2}\right)\sin\left... ...cos(A)\cos(B)}}% {\tan(A+B)}{\frac{\tan(A+B)}{1-\tan(A)\tan(B)}} \end{eqnarray*}$$