cos5x = -1/25x=±arccos(-1/2) + 2πk5x = ± 2π/3 + 2πkx =± 2π/15 + 2пk/5
cos5x = -1/25x= +-arccos(-1/2) + 2пk5x = +- 2п/3 + 2пkx = +- 2п/15 + 2пk/5ответ: +- 2п/15 + 2пk/5
cos5x = -1/2
5x=±arccos(-1/2) + 2πk
5x = ± 2π/3 + 2πk
x =± 2π/15 + 2пk/5
cos5x = -1/2
5x= +-arccos(-1/2) + 2пk
5x = +- 2п/3 + 2пk
x = +- 2п/15 + 2пk/5
ответ: +- 2п/15 + 2пk/5