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Sine-Tangent Theorem


If

 (sinalpha)/(sinbeta)=m/n,

then

 (tan[1/2(alpha-beta)])/(tan[1/2(alpha+beta)])=(m-n)/(m+n).

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Cite this as:

Weisstein, Eric W. "Sine-Tangent Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Sine-TangentTheorem.html

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