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Half-Angle Tangent Identities

\begin{displaymath}
\begin{array}{rclrcl}
\mr {t\;\isdef \;\tan\left(\frac{\thet...
...1+t^2}}%
\mrone {\tan(\theta)}{=}{\frac{2t}{1-t^2}}
\end{array}\end{displaymath}


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[How to cite this work] [Order a printed hardcopy]

``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
CCRMA  [Automatic-links disclaimer]