Trigonometry
Trigonometric identities
Pythagorean identity, double angles and addition formulas.
Trigonometry
Pythagorean trigonometric identity
sin²α + cos²α→TrigonometryTangent from sine and cosine
tan α = sin α / cos α→TrigonometrySine double angle
sin 2α = 2sin α cos α→TrigonometryCosine double angle
cos 2α = cos²α − sin²α→TrigonometrySine angle sum
sin(α+β) = sinα cosβ + cosα sinβ→TrigonometryCosine angle difference
cos(α−β) = cosα cosβ + sinα sinβ→