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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*}


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``Introduction to Digital Filters with Audio Applications'', by Julius O. Smith III, (August 2006 Edition).
Copyright © 2007-02-02 by Julius O. Smith III
Center for Computer Research in Music and Acoustics (CCRMA),   Stanford University
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