Sen (α+β)= Senα Cos β + Cos αSen β

Cos (α+ β)= Cosα Cosβ – Sen α Sen β

Tan (α+ β)= (Tanα+Tanβ)/(1-TanαTanβ)

Sen (α-β)= Senα Cos β -Cos αSen β

Cos (α- β)= Cosα Cosβ + Sen α Sen β

Tan (α-β)= (Tanα-Tanβ)/(1+TanαTanβ)

Tanθ/2 = + - √((-1 cos θ )/(1+cos θ))

Tanθ/2= (Senθ )/(1+cos θ)

Sen θ/2 = + - √((1-cosθ)/2)

Cos θ/2 = + - √((1+cos θ )/2)

Sen2α= 2sen α Cos α

Cos2α= Cos2α - Sen2α

Cos2= α 1-2Sen2α

Cos2 α= 2 cos2 α -1

Tan2α= (2 tan α)/(1-tan^2 α)

CosθSecθ= 1

Cosθ= 1/Secθ

SenθCscθ= 1

Senθ= 1/cscθ

Cscθ= 1/senθ

TanθCotθ= 1

Tanθ= 1/cotθ

Cotθ= 1/Tanθ

Tanθ= Senθ/Cosθ

Senθ= Tanθcosθ

Cosθ= Senθ/Tanθ

Tanθ= Senθ/Cosθ

Senθ= Tanθcosθ

Cosθ= Senθ/Tanθ