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Mathematics 13 Online
OpenStudy (anonymous):

can you help me

OpenStudy (anonymous):

what r u tryna do

OpenStudy (anonymous):

cos2x=cos2x-sin2x (1/\[\sqrt{5}\](1/\[\sqrt{5}\])-(2/ \[\sqrt{5}\])(2/\[\sqrt{5}\])=1/5-4/5= -3/5 am i right

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