Trignometry best formulae

Trigonometry

In a right-angled triangle,

Sinθ= Opposite Side/Hypotenuse
Cosθ= Adjacent Side/Hypotenuse
Tanθ= Sinθ/Cosθ = Opposite Side/Adjacent Side
Cosecθ = 1/Sinθ= Hypotenuse/Opposite Side
Secθ = 1/Cosθ = Hypotenuse/Adjacent Side
Cotθ = 1/tanθ = Cosθ/Sinθ = Adjacent Side/Opposite Side
SinθCosecθ = CosθSecθ = TanθCotθ = 1
Sin(90-θ) = Cosθ, Cos(90-θ) = Sinθ
Sin²θ + Cos²θ = 1
Tan²θ + 1 = Sec²θ Cot²θ + 1 = Cosec²θ