Question

Evaluate sin 5pi/4 Thank you

Answer 1

Answer:

-sqrt(2)/2

Step-by-step explanation:

5pi/4 lies in the third quadrant with basic angle: 5pi/4 - pi = pi/4

sin(pi/4) = sqrt(2)/2

Since it's in quadrant 3, sin would be negative

sin(5pi/4) = -sqrt(2)/2

sqrt: square root

Answer 2

Answer:

3.92699081699

Step-by-step explanation:

$\frac{5(3.14)}{4}$=15.7/4