Can someone please help me solve this identity? I need all steps. I really just do not understand it :/

thank you !

sin^4 β - cos^4 β = 1 - 2cos^2 β

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- Apr 5th 2010, 04:32 PMdlngoalProve this identity?
Can someone please help me solve this identity? I need all steps. I really just do not understand it :/

thank you !

sin^4 β - cos^4 β = 1 - 2cos^2 β - Apr 5th 2010, 05:39 PMdlngoal
I mean *PROVE this identity.

using trigonometric identities :| - Apr 5th 2010, 06:15 PMharish21
- Apr 5th 2010, 06:20 PMdlngoal
You are a life saver thank youu

- Apr 5th 2010, 06:23 PMharish21
- Apr 5th 2010, 06:29 PMdlngoal
Yess! You are! haha