View Full Version : Pre calc / Trig
sweetie_rearea2008
Dec 17, 2006, 07:41 PM
Can anyone tell me how to work/prove this identity?! I just don't understand! Cot*sec =1/sin
help asap please!
Capuchin
Dec 17, 2006, 07:45 PM
do you have your definitions for cot and sec in terms of cos and sin and tan?
It should be straight forward :)
rawpotatoeater37
Dec 17, 2006, 07:49 PM
cot x * sec x = 1/sin x
cot x is the opposite of tan x, which is sin x/cos x. Therefore cot x is cos x/sin x.
sec x is the opposite of cos x. Therefore sec x is 1/cos x.
cos x/sin x * 1/cos x =...
Capuchin
Dec 17, 2006, 07:53 PM
Thank you for doing someone's homework for them.
rawpotatoeater37
Dec 17, 2006, 08:02 PM
Sorry- I'm new at this.
Capuchin
Dec 18, 2006, 05:26 AM
It's okay, when it's obviously a homework question we like to just hint :)
rawpotatoeater37
Dec 18, 2006, 09:13 AM
Sounds good
Thanks!
Capuchin
Jan 2, 2007, 03:19 AM
I think that your statement of "cot is the opposite of tan" is particularly misleading also. Reciprocal is a better word.
*nitpick*