Question

giá trị cos \(\dfrac{5\pi}{6}\) bằng bao nhiêu?

Answer 1

\(\dfrac{5\Pi}{6}.\dfrac{\Pi}{180}=150\)

Answer 2

Cos \(\dfrac{5\pi}{6}=-cos\dfrac{\pi}{6}=\dfrac{-\sqrt{3}}{2}\)

Answer 3

\(\dfrac{5\pi}{6}\times\dfrac{180}{\pi}=150\)