Posted by **Jon** on Thursday, February 14, 2008 at 6:33pm.

Which expression is equivalent to tan theta-sec theta/sin theta?

A)-cot theta

B)cot theta

C)tan theta-cot theta

D)tan theta-sec^2theta

just tell me what I need to know to set it up

- I dont think drawing a picture will help me drwls -
**SraJMcGin**, Thursday, February 14, 2008 at 6:48pm
Thank you for using the Jiskha Homework Help Forum. If it's Math, I doubt I can help you, but try these sites:

1. http://mb.sparknotes.com/mb.epl?b=986&m=1268516&p=4&t=358012&w=1

2. (Physics post): http://www.physicsforums.com/archive/index.php/t-58628.html

3. (Trig, part II of #3): http://www.physicsforums.com/archive/index.php/t-159316.html

4. (Trig with drawing): http://www.answers.com/topic/list-of-trigonometric-identities?cat=technology

- math -
**Jon**, Thursday, February 14, 2008 at 7:15pm
trig identities are like in a different language for me. can I please get at least 1 step to get started. I looked at all the sites about it but if I don't understand what im looking at it does no good, I know how to read I just don't get it.

- I dont think drawing a picture will help me drwls -
**Count Iblis**, Thursday, February 14, 2008 at 7:49pm
Notation: sin(theta) = s; cos(theta) = c.

Then tan(theta) = s/c and

sec(theta) = 1/c

We can write:

s/c - 1/(cs) = (s^2 - 1)/(cs) = -c/s = Answer A

- I dont think drawing a picture will help me drwls -
**Jon**, Thursday, February 14, 2008 at 7:58pm
I understand that a little thank you sooo much for explaining it.

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