# Homework Help: Easy trig question

1. Sep 14, 2012

### GreenPrint

I feel kind of dumb asking this (it's been a while sense I took precalc) but I always thought that if I had something like

that if I added any whole integer multiple of 2pi to the answer I would get equivalent answers. Is this correct? Like

you get different angles but they can still act as correct answers to
arctan(stuff)?

2. Sep 14, 2012

### SammyS

Staff Emeritus
tan(x) is periodic with a period of π .

In other words, if tan('answer') = stuff, then it's also true that tan('another answer') = stuff .

3. Sep 14, 2012

### GreenPrint

ok well in this case i can add multiples of two pi's as well than?

4. Sep 14, 2012

### SammyS

Staff Emeritus
Sure, since 2π is an integer multiple of π .