Question
Wed June 20, 2012 By:

sir i could not understand How the sign function starts over after every block of 2pi? sir please explain it to me.

Expert Reply
Wed June 20, 2012
The sin and cos functions are periodic functions.
a periodic function is defined as:
f(x+a) = f(x)   with a periodicity of a
 
thus sin and cosin fuctions are periodic functions with a periodicity of 2pi
 
as you can see in their graphs that their values repeat after an interval of 2pi
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