Graph of Trig. Functions:

Consider x as a real number or an angle in radians.
If f is any trig. function then f( x + 2p ) = f(x) ; Therefore the graph of the function has an interval of 2p.

Graph of f(x) = sin x :

Graph of f(x) = cos x :

Graph of f(x) = csc x :

Graph of f(x) = sec x :

The functions above are periodic of period 2p.

Graph of f(x) = tan x :

Graph of f(x) = cot x :

The functions above are periodic of period p.