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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- April 5th 2010, 03:32 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 - April 5th 2010, 04:39 PMdlngoal
I mean *PROVE this identity.

using trigonometric identities :| - April 5th 2010, 05:15 PMharish21
- April 5th 2010, 05:20 PMdlngoal
You are a life saver thank youu

- April 5th 2010, 05:23 PMharish21
- April 5th 2010, 05:29 PMdlngoal
Yess! You are! haha