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OpenStudy (anonymous):
prove that cos^4x-sin^4x = cos2x
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OpenStudy (carniel):
This is for the Math group plz go there if u need help.
OpenStudy (trancenova):
Hello, yep this is a math question and this is the Open Study feedback section. Post only questions in here that are feedback about the site. This question is now closed as its in the wrong subject. The math section can be found by pressing "find more subjects" above. If you have any questions feel free to ask.
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