Trigonometry Identity: tan(-x) = -tan(x)

In this video I prove the trigonometry identity tan(-x) = -tan(x) and show how it is considered an odd function with the property f(-x) = -f(x).

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[mes]

I don't always prove trig identities but when I do I usually show the trig function is either even or odd ;)

[ashutosh]

I like your way of explaining this in such a magnificent easy way...

[pocketdialmusic]

Looks like you have a typo in title and description as you've written 'tan(-x) = tan(x)'

[faizanali]

If negative theta is at third quadrant then if we prove it than its not negative, ???