Triple Angle Formulas

Triple Angle Formula for Tangent
where $\sin, \cos, \tan$ denote sine, cosine and tangent respectively.

Triple Angle Formula for Hyperbolic Tangent
where $\sinh, \cosh, \tanh$ denote hyperbolic sine, hyperbolic cosine and hyperbolic tangent respectively.

Also see

 * Double Angle Formulas
 * Quadruple Angle Formulas