Question

How do you evaluate `sin ((7pi)/4)`?

Answer 1

`- sqrt2/2`

Explanation:

Trig table and trig unit circle -->
`sin ((7pi)/4) = sin (-pi/4 + (8pi)/4) = sin (-pi/4 + 2pi) =`
`= sin (-pi/4) = - sin (pi/4) = - sqrt2/2`