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OpenStudy (anonymous):
prove that cos4x - sin4x = cos2x
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hartnn (hartnn):
@lidya , hi :) \(\Huge \mathcal{\text{Welcome To OpenStudy}\ddot\smile} \) The question you have asked belongs to maths section, http://openstudy.com/study#/groups/Mathematics This is feedback section used to give feedback and suggestions. Go to maths section and ask your question again, and please close this question here.
OpenStudy (anonymous):
thank u
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