*Even & odd functions
*Even & odd functions
A function f (x) is called even, if f (- x) = + f (+x).
called, odd, if f (- x) = – f (+x).
otherwise called neither even nor odd.
cos and sec are even and remaining tan, cot, csc & sin are odd, thus
cos(- x) = + cos x & sec(- x) = + secx
sin(- x) = – sin x & csc(- x) = – csc x
tan(- x) = – tan x & cot(- x) = – cot x
