Last edited by z1llch; Jun 23rd 2009 at 07:18 AM. Reason: have no idea how to eliminate the one.
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The identity can be rewritten as: which is always true.
Last edited by alexmahone; Jun 23rd 2009 at 07:50 AM.
arent i suppose to use the left hand side only, and prove it is equal to the right hand side?
Last edited by z1llch; Jun 23rd 2009 at 07:54 AM.
Originally Posted by z1llch arent i suppose to use the left hand side only, and prove it is equal to the right hand side? No; you can cheat.
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.
Originally Posted by z1llch We can write it as,
Originally Posted by alexmahone No; you can cheat. to prove an identity, you must work with one side at a time
thank you great_math. took me an hour to come up with those lines this morning. but mine is way longer..
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