Mathematics, 30.07.2019 12:00 djub
Cos 4a - cos 4b = 8(cos a - cos b) (cos a +cos b) (cos a - sin b) (cos a + sin b)
Answers: 2
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Cos 4a - cos 4b = 8(cos a - cos b) (cos a +cos b) (cos a - sin b) (cos a + sin b)...
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