Keozisim
6 год назад
Cosxcos3x - sin3xsinx = 1/2
ОТВЕТЫ
Nasalkezh
Jun 30, 2019
Cosxcos3x - sin3xsinx = 1/2
cos(3x + x) = 1/2
cos 4x = 1/2
4x = ±п/3 + 2пn , n ∈ Z |:4
x = ±п/12 + пn/2, n ∈ Z
cos(3x + x) = 1/2
cos 4x = 1/2
4x = ±п/3 + 2пn , n ∈ Z |:4
x = ±п/12 + пn/2, n ∈ Z
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