Ответ:
Объяснение:
(cos(x+1))(cos(x-1))= cos(2)/2 + cos(2x)/2
(cosx + 1)(cos x -1) = cos2x -1
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Ответ:
Объяснение:
(cos(x+1))(cos(x-1))= cos(2)/2 + cos(2x)/2
(cosx + 1)(cos x -1) = cos2x -1