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robdhunter
Dec 13, 2008, 11:37 PM
1-tan2a5/1+tan2a=cos2a-sin2a

Credendovidis
Dec 14, 2008, 06:25 AM
Dear Rob,

And your question is?

I did trigonometry, but unfortunately failed the mind-reading course...

Maybe this link to Dave's Short Trig Course (http://www.clarku.edu/~djoyce/trig/) will help you. Special attention for chapter 16 : Summary of trigonometric identities.

If not please state clearly with what I can help you...

:)

DollyHolly
Mar 30, 2009, 06:24 PM
(1+cos(x))/(sin(x)) + (sin(x))/(1+cos(x))=2 csc(x)

galactus
Mar 31, 2009, 06:48 AM
\frac{1+cos(x)}{sin(x)} + \frac{sin(x)}{1+cos(x)}=2 csc(x)

See here:

https://www.askmehelpdesk.com/math-sciences/proving-trigonometric-identities-324123.html