Question

How do you find the exact value of the following using the unit circle cos (53 pi / 6)?

Answer 1

`- sqrt3/2`

Explanation:

Use trig table and unit circle
`cos ((53pi)/6) = cos (-pi/6 + (54pi)/6) = cos (-pi/6 + pi) =`
`= - cos (pi/6) = - sqrt3/2`