Posted by **Jiskhaa** on Tuesday, May 22, 2012 at 5:28am.

If tan theta= 1/5

Simplify tan(540-theta)

In the unit circle do I have to go clockwise or anti-clockwise from the fourth quadrant?

Please help is needed for this

- Maths -
**Steve**, Tuesday, May 22, 2012 at 9:38am
Since 540 = 3*180

and the period of tan(x) is 180

tan(540-x) = tan(-x) = -tan(x) = -1/5

However, to answer your question, yo need to go clockwise, since you have tan(-x).

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