Cos(2П/7-4х)=корень2/2

Question

Cos(2П/7-4х)=корень2/2

Answer 1

Пошаговое объяснение:

2П/7-4x=П/4+2пk

2п/7-П/4-2Пk=4x

П/28-2Пk=4x

х=П/112-Пk/2

2П/7-4x=-П/4+2пk

x=15П/112-Пk/2