:copyright: 2005 Paul DawkinsTrig Cheat SheetDefinition of the Trig Functions
Right triangle definition
For this definition we assume that0
2
πθ< < or 0 90θ° < < ° .oppositesin
hypotenuseθ =
hypotenusecsc
oppositeθ =adjacent
coshypotenuse
θ =hypotenuse
secadjacent
θ =opposite
tanadjacent
θ =adjacent
cotopposite
θ =Unit circle definition
For this definition θ is any angle.sin1
yyθ = =
1csc
yθ =cos
1
xxθ = =
1sec
xθ =tan
y
xθ = cot
x
yθ =Facts and Properties
Domain
The domain is all
