Question

Помогите пожалуйста cos3x =sin3x

Answer 1

$cos(3x) = sin(3x) \ sin(3x) = 0 \ x = frac{kpi}{3} \ frac{ cos(3x) }{ sin(3x) } = 1 \ cot(3x) = 1 \ 3x = arccot(1) \ 3x = frac{pi}{4} \ 3x = frac{pi}{4} + kpi \ x = frac{pi}{12} + frac{kpi}{3}$