leeminhyuk
leeminhyuk
22-04-2017
Mathematics
contestada
Cos^2x-cos^6x=sin4xsin8x
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PrinceMinusB
PrinceMinusB
22-04-2017
(cos2x+cos6x)(cos2x-cos6x) =
(2 sin 4x cos 4x) (2 sin 2x cos 2x) =
sin 8x sin 4x (Answer)
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