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OpenStudy (anonymous):
how do prove this identity: sin^4x -cos^4x=1-2cos^2x
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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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