# Thread: Help with Trigonometric Identities

1. ## Help with Trigonometric Identities

I need help with a project that is due tomorrow. I spent my entire spring break trying to figure it out and I have 9 out of 25 left. Please help me????????????????????

2. Originally Posted by 2Lagit2Quit
I need help with a project that is due tomorrow. I spent my entire spring break trying to figure it out and I have 9 out of 25 left. Please help me????????????????????
what are the questions?

and i think it's 2legit2quit, unless you're using lagit as a pun for something

3. Here are the questions 2Lagit2Quit meant to post
Originally Posted by 2Lagit2Quit
sin x + 1-cos x =2csc x
1-cos x sin x

1 = sec(squared)x + sec x tan x
1-sin x

1+sin x = 2sec(squared)x + 2sec x tan x-1
1-sin x

cos x + sin x = sec(squared) x-tan(squared)x
sec x csc x
Here's the solution to the first:

4. Here's number 2

5. Here's the third:

6. Finally, here's the last 1

7. ## Tips

Here's how to approach these problems:

Step 1: Start working on the most complicated side, that gives you more options to change stuff

Step 2: Change everything to sine and cosine, students are most familiar with these and so they can see connections easier

Step 3: If you can't make one side look like the other, stop and start working on the other side to bring it to where you left off from the first side (I illustrated this technique in the last problem, it probably wasn't necessary though, but just wanted to show you)

8. Here are the rest of the problems

Originally Posted by 2Lagit2Quit
csc x + cot x = cot x csc x
tan x +sin x

sec x = sec(squared)x + sec x tan x
sec x-tan x

csc(squared)x - cos(squared)x csc(squared)x = 1

1 + 1 = 2sec(squared)x
1-sin x 1+ sin x

tan x + sin x = cot x + sec x csc x
1 + cos x 1-cos x

9. Here:

10. Here

11. Here's the next one

12. ...and the next one...

13. Now for the real last one

14. ## I meant LAGIT but thanks for your concern.

Originally Posted by Jhevon
what are the questions?

and i think it's 2legit2quit, unless you're using lagit as a pun for something

I meant LAGIT but thanks for your concern.