Reciprocal Relations

Sinθ.Cosecθ = 1
Cosθ.Secθ   =  1
Tanθ.Cotθ   =  1

Sinθ        = 1 / Cosecθ
Cosecθ   = 1 / Sinθ
Cosθ       = 1 / Secθ
Secθ        = 1 / Cosθ
Tanθ        = 1 / Cotθ
Cotθ        = 1 / Tanθ