I would use the following:

to obtain:

Results 1 to 4 of 4

- Jul 20th 2013, 08:30 PM #1

- Joined
- Jun 2013
- From
- Toronto
- Posts
- 15

## Please Help me

So I was trying to solve this problem arcsin(sin(-3pi/5)

and so far I got that the arcsin(sin) can't cancel because the -3pi/5 is out the range of pi/2<x<-pi/2

So I looked for the reference angle...

and I know that -3pi/5 will lay on QIII because is going clockwise.

So I looked at the theta hat, and I see that theta hat is -2pi/5..

Is this right... or do I have a mistake... please help. I kind it feel that I did something wrong.

- Jul 20th 2013, 08:39 PM #2

- Jul 20th 2013, 08:49 PM #3

- Joined
- Sep 2012
- From
- United States
- Posts
- 106
- Thanks
- 21

- Jul 20th 2013, 09:00 PM #4

- Joined
- Jun 2013
- From
- Toronto
- Posts
- 15