Решение:
2cos (a+b+a-b/2) * cos (a+b-(a-b)/2)
2cos (2a/2) * cos (a+b-a+b/2)
2cos (a) * cos (2b/2)
2cos (a) * cos (b).
Ответ: 2cos (a) * cos (b).
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Решение:
2cos (a+b+a-b/2) * cos (a+b-(a-b)/2)
2cos (2a/2) * cos (a+b-a+b/2)
2cos (a) * cos (2b/2)
2cos (a) * cos (b).
Ответ: 2cos (a) * cos (b).