Вычислите: \(cos165^0+cos75^0\) . \(-\sqrt{2}\) \(-\frac{ \sqrt{2}}{2}\) \(\frac{ \sqrt{2}}{2}\) \(\sqrt{2}\)
Задание

Вычислите: \(cos165^0+cos75^0\) .

  • \(-\sqrt{2}\)
  • \(-\frac{ \sqrt{2}}{2}\)
  • \(\frac{ \sqrt{2}}{2}\)
  • \(\sqrt{2}\)