Help with Math problems

[madet0rder]

Here is a list of problems. I know, Im sorry. I know Im not supposed to do a list but the chapter we are on I dont get. I took one problem from every lesson. Even help with one problem would be helpful.

1. Find all solutions to csc x= -1.15 in the interval 0<x<2pi.

2. Solve 15cos^2(x) - 7cosx-4=0 by factoring and find solutions in 0<x<2pi.

3. Use appropriate addition formula to simplify cos(A-B) given sec(A) = -2/?3 where 90°<A<180° and tan(B) = 1/4 where 0°<B<90°

4. Find all solutions of 2sin^2(x) - 9sin(x)+4=0. Express in radians

5. Find all solutions to sin(3x) = -?2/(2) in interval 0<x<2pi.

6. Find all solutions for 2sin(x) = ?2cos(2x) in interval 0<x<2pi.

7. Verify the following identity: cos(4x) = 8cos^4(x) - 8cos^2(x) + 1.

Thank you! I am extremely gratful.

 

[skeeter]

solving trig equations

 

[stapel]

...the chapter we are on I dont get.

Unfortunately, if you don't understand an entire chapter, then I'm afraid you need much more help than we can here provide. At the very least, you need to learn whatever material was missing which prevented you from making any headway at all for this chapter, and then the contents of this chapter. Obviously we cannot, in a simple forum posting, replicate the many hours of classroom instruction which were required in your classroom. Sorry!

Please consider hiring a qualified local tutor and setting aside a few hours a week for concentrated study. (Daily sessions would be best.) Your tutor, by meeting with you face to face, reviewing your book, your class notes, and your work so far, will be best placed to figure out where things went wrong, and can start your personalized lessons from that point. With luck and some hard work, you could be caught up with your class in only a few weeks! :wink:

My best wishes to you in your studies!

Eliz.