Question

How do I find the value of sin (5Pi/4)?

Answer 1

Find `sin ((5pi)/4)`

Ans: `-sqrt2/2`

Explanation:

Trig unit circle shows -->
`sin ((5pi)/4) = - sin (pi/4)`
Trig Table of Special Arcs gives --> `sin (pi/4) = sqrt2/2`, therefor:
`sin ((5pi)/4) = - sqrt2/2`