How can I tell if each of these functions are even or odd?

$\displaystyle f(x) = \sin{x}$

$\displaystyle f(x) = \cos{x}$

$\displaystyle f(x) = \tan{x}$

$\displaystyle f(x) = \sec{x}$

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- Aug 9th 2009, 07:23 AMlive_laugh_luv27even/odd trig functions
How can I tell if each of these functions are even or odd?

$\displaystyle f(x) = \sin{x}$

$\displaystyle f(x) = \cos{x}$

$\displaystyle f(x) = \tan{x}$

$\displaystyle f(x) = \sec{x}$ - Aug 9th 2009, 07:39 AMPlato