Question

What us the exact value of cos(5pi/6)?

Answer 1

Ans: √3/2

Explanation:

cos(5pi/6)=COS(-pi/6+pi)= -cos (pi/6)

cos(5pi/6)= -cos(pi/6)= negative square root of 3/2

Answer 2

Exact form:

-√3/2

Decimal form:

-0.866

Explanation: