Question

what is the sine value of 2pi/3??

-1/2

1/2

-sqrt3/2

sqrt3/2

Answer 1

@mathmale
@ganeshie8

Answer 2

@thomas5267

Answer 3

if you are not going to memorize it , which you should, use a calculator

Answer 4

http://www.wolframalpha.com/input/?i=sin%282pi%2F3%29

Answer 5

\[
\sin\left(\frac{2\pi}{3}\right)=\sin(120^\circ)=\sin(60^\circ)=\text{draw triangle}
\]