Предмет: Алгебра, автор: tanyaodruzova

2cos x = -√2помогите пожалуйста ,срочно (((

Ответы

Автор ответа: nKrynka

Решение
2cosx = - √2
cosx = - √2/2
x = (+ -) arccos(- √2/2) + 2πk, k∈ Z
x = (+ -) (π - arccos(√2/2)) + 2πk, k ∈ Z
x = (+ -) (π - π/4) + 2πk, k ∈ Z
x = (+ -) (3π/4) + 2πk, k ∈ Z

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