Question

what is sin 2pi/3? how do you solve wihtout a calculator?

Answer 1

Root3/2.

Answer 2

but how do i solve it?
i completely forgot trig

Answer 3

unit circle

Answer 4

2pi/3 is the same at pi/3.
pi/3 is a 60 degree angle.
Sin is Opposite/Hypotenuse.
so it would be Root3/2.

Answer 5

\[\frac{2 \pi}{3} \cdot \frac{180^o}{\pi}=120^o\]
maybe you think better using degrees