Secant, cosecant and cotangent

secant x or sec x =     1    
                             cos x

cosecant x, or cosec x =    1   
                                   sin x

cotangent x, or cot x =   1   
                                tan x

Note, sec x is not the same as arccos x.

Example:
If sec x = 2, cos x = ½, x = 60º
Graphs of sec x and cosec x