Ответ:
2•sin3a•sin5a
Объяснение:
sin5a•sin3a + cos5a•cos3a = cos(5a-3a) = cos2a
cos2a - cos8a = -2•sin(2a-8a)/2•sin(2a+8a)/2 = 2•sin3a•sin5a
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Ответ:
2•sin3a•sin5a
Объяснение:
sin5a•sin3a + cos5a•cos3a = cos(5a-3a) = cos2a
cos2a - cos8a = -2•sin(2a-8a)/2•sin(2a+8a)/2 = 2•sin3a•sin5a