Tuesday, December 2, 2008

Periodic function

A function f(x) is said to be a periodic function if there exists a positive real number T such that f(x+T) = f(x) for all x Є R.

Periodic functions and their periods

sin x 2 π

cos x 2 π

tan x π

Some Results on periodic functions

If f(x) is a periodic function with period T and a,b Є R such that a is g.t. 0, then f(ax+b) is periodic with period T/a.

If (f1(x), f2(x) and f3(x) are periodic functions with periods T1,T2,and T3 respectively, then a1f1(x)+a2f2(x)+a3f3(x) is a periodic function with period equal to LCM of T1,T2,T3 and where a1,a2, and a3 are non-zero real numbers.

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