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Cos (u/2)
(+ or -) Square root of 1 + Cosu / 2
Sin (u/2)
(+ or -) Square root of 1 - Cosu / 2
Tan (u/2)
1 - Cosu / Sinu or Sinu/ 1 + Cosu
Sin2x
2SinX * CosX
Tan2x
2TanX/1-Tan^2X Sin2X/ Cos2X
Sin(x +or- y)
SInX * CosY (+ or -) Cosx * SinY
Tan(x + or - y)
TanX (+ or -) Tany/ 1 (- or +) TanX * Tan Y
Cos(x + or - y)
CosX * CosY (- or +) SinX * SinY
Cos2X
Cos^2X - Sin^2X 1 - 2sin^2X 2 Cos^2X-1
