Law of Tangents

Author

Eric W. Weisstein
January 20, 2006

This notebook downloaded from http://mathworld.wolfram.com/notebooks/Trigonometry/LawofTangents.nb.

For more information, see Eric's MathWorld entry http://mathworld.wolfram.com/LawofTangents.html.

©2006 Wolfram Research, Inc. except for portions noted otherwise

Iniialization

Identity

FullSimplify[ToSidelengths[((Tan[(1/2)(A-B)])/(Tan[(1/2)(A+B)]))],TriangleQ[]]//Together