Source: wikibot/tangent-half-angle-formula
= Tangent half-angle formula
{wiki=Tangent_half-angle_formula}
The tangent half-angle formulas relate the tangent of half of an angle to the sine and cosine of the angle itself. The tangent half-angle formulas are given by: 1. In terms of sine and cosine: \\\[ \\tan\\left(\\frac\{\\theta\}\{2\}\\right) = \\frac\{\\sin(\\theta)\}\{1 + \\cos(\\theta)\} \\\] 2.