===== Ángulo Triple =====

==== sin 3x ====
  * <m 15>sin 3x ~=~  3 sin x - 4 sin^3 x</m>
  * <m 15>sin 3x ~=~  sin x ( 2 cos 2x + 1 )</m>
  * <m 15>sin 3x ~=~  4 sin x. sin(60 + x) . sin(60 - x)</m>

==== cos 3x ====
  * <m 15>cos 3x ~=~  4 cos^3 x - 3 cos x</m>
  * <m 15>cos 3x ~=~  cos x (2 cos 2x - 1 )</m>
  * <m 15>cos 3x ~=~  4 cos x . cos (60 + x) . cos(60 - x)</m>

==== tan 3x ====
  * <m 15>tan 3x ~=~  { 3 tan x - tan^3 x }/{ 1 - 3 tan^2 x }</m>
  * <m 15>{ tan 3x }/{tan x} ~=~  { 2 cos 2x + 1 }/{ 2 cos 2x - 1 }</m>
  * <m 15>tan 3x ~=~  tan x . tan (60+x) . tan (60 - x)</m>
  * <m 15>3 tan 3x ~=~  tan x + tan (60 + x) + tan (60 - x)</m>