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- June 23rd 2009, 07:17 AMz1llchidentity
- June 23rd 2009, 07:28 AMalexmahone
The identity can be rewritten as:

which is always true. - June 23rd 2009, 07:28 AMz1llch
arent i suppose to use the left hand side only, and prove it is equal to the right hand side?

- June 23rd 2009, 08:07 AMalexmahone
- June 23rd 2009, 08:13 AMz1llch
hahaha. i'm stuck with the number 1. guessed i'm supposed to use the cos2+sin2=1 formula to get rid of it, but do not know how. or maybe i;m wrong, there other way. (Nerd)

- June 23rd 2009, 09:13 AMgreat_math
- June 23rd 2009, 10:40 AMJhevon
- June 24th 2009, 12:54 AMz1llch
thank you great_math.

took me an hour to come up with those lines this morning. but mine is way longer.. (Whew)