Question

how do you solve sin (5pi/3) without a calculator?

Answer 1

sin(5pi/3)=sin(300)=sin(60)=sqrt(3)/2

sin300=sqrt(3)/2

Make sense?

Answer 2

unit circle

Answer 3

Oops. That should be -sin(60), and therefore -sqrt(3)/2

Answer 4

why???

Answer 5

do u know the unit circle

Answer 6

http://www.mathpeer.com/images/trig/unit_circle.gif

Answer 7

Sin 5pi/3 = Sin (pi -5pi/3) = sin -2pi/3 = - sin 2pi/3

= Sin pi -2pi/3 = sin pi/3 = sqrt(3)/2

Answer 8

Use sin (pi-t) = sin t and sin-t = -sin t