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OpenStudy (anonymous):

how do prove this identity: sin^4x -cos^4x=1-2cos^2x

OpenStudy (anonymous):

RS: (sin^2x+cos^2x)-2cos^2x sin^2x-cos^2x Thats how much i can simplify right side..

OpenStudy (anonymous):

@sabika13 your posting in the wrong subject, post in math you will get tons more help

OpenStudy (anonymous):

oh shoot, didnt realize that..thanks

OpenStudy (anonymous):

@sabika13 its ok lol goodluck

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