I can't figure this question, please help me.

arcsin(sin(-3pi/5))

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- Jul 19th 2013, 07:44 PMTrimHondurasPlease help me on my Homework.
I can't figure this question, please help me.

arcsin(sin(-3pi/5)) - Jul 19th 2013, 08:06 PMchiroRe: Please help me on my Homework.
Hey TrimHonduras.

Hint: What possible values can arcsin have? Also what sin(-x) in terms of sin(x) and what is sin(pi+x) in terms of sin(x)? - Jul 19th 2013, 09:07 PMbluffyRe: Please help me on my Homework.
ans:

-1.25663706 rad

- Jul 20th 2013, 06:38 AMtopsquarkRe: Please help me on my Homework.
Please don't just give out answers to homework problems. This is against MHF policy and will not be tolerated.

-Dan - Jul 20th 2013, 07:04 AMHallsofIvyRe: Please help me on my Homework.
- Jul 20th 2013, 07:56 AMProve ItRe: Please help me on my Homework.
For starters, SURELY you know that sine and arcsine are inverse functions, and so cancel each other out...

- Jul 20th 2013, 06:09 PMTrimHondurasRe: Please help me on my Homework.
So far I got I got that the -3pi/5 falls on QIII, and that my reference angle (theta hat)= 2pi/5. So the answers is -2pi/5.... is this right!