• Sep 19th 2013, 01:26 PM
nhoward
Screenshot by Lightshot <----

I have been doing math for 6 hours straight and my brain is fried. These are the last questions due on my hw and I don't understand. Please help!!!

Any kind of insight would help.

Thanks so much!!
• Sep 19th 2013, 06:09 PM
chiro
Hey nhoward.

In terms of Q5,Q6,Q7 you need to find the values which the inequalities have in common.

We know that sin(x) is > 0 when x is in [0,pi] and < 0 when x is in (pi,2pi). cos(x) is > 0 when x is [0,pi) and (3*pi/2,2pi]

With regards to trigonometric functions do you have to find a value for theta or is it something else? The reason I ask is because they give values for r which implies that you need to use that to find something.
• Sep 19th 2013, 08:31 PM
Prove It
Quote:

Originally Posted by nhoward
Screenshot by Lightshot <----

I have been doing math for 6 hours straight and my brain is fried. These are the last questions due on my hw and I don't understand. Please help!!!

Any kind of insight would help.

Thanks so much!!

Have you made any attempt at all? We are not a homework service, you are only supposed to post two questions per thread, and you are supposed to show some effort - i.e. show what you have tried and exactly where you are stuck.
• Sep 20th 2013, 10:05 AM
MINOANMAN