Question

What is the exact value of cos(5π/6)?


−√3/2

−1/2

√3/2

1/2

Answer 1

Answer:

3rd option

Step-by-step explanation:

cos($\frac{5\pi }{6}$ ) ← is an angle in the 2nd quadrant where cos < 0

= - cos(π - $\frac{5\pi }{6}$ )

= - cos($\frac{\pi }{6}$ )

= - $\frac{\sqrt{3} }{2}$