Решение:
1sin (a) * cos (4a) + cos (4a) * sin (a)
1sin (a) * cos (4a) + 1cos (4a) * sin (a)
(1+1) * sin (a) * cos (4a)
2sin (a) * cos (4a)
Ответ: 2sin (a) * cos (4a).
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Решение:
1sin (a) * cos (4a) + cos (4a) * sin (a)
1sin (a) * cos (4a) + 1cos (4a) * sin (a)
(1+1) * sin (a) * cos (4a)
2sin (a) * cos (4a)
Ответ: 2sin (a) * cos (4a).