# Please help me on my Homework.

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• Jul 19th 2013, 07:44 PM
TrimHonduras
Please help me on my Homework.
I can't figure this question, please help me.

arcsin(sin(-3pi/5))
• Jul 19th 2013, 08:06 PM
chiro
Re: 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 PM
bluffy
Re: Please help me on my Homework.
ans:
-1.25663706 rad

• Jul 20th 2013, 06:38 AM
topsquark
Re: 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 AM
HallsofIvy
Re: Please help me on my Homework.
Quote:

Originally Posted by bluffy
ans:
-1.25663706 rad

I can't help but think this was intended as a joke. Either that or "bluffy" has no clue what the problem is and is just "bluffing"!
• Jul 20th 2013, 07:56 AM
Prove It
Re: 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 PM
TrimHonduras
Re: 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!