Answer
a.) $\frac{\sqrt 3}{2}$
b.) -$\frac{\sqrt 3}{2}$
Work Step by Step
a.)sin$\frac{2\pi}{3}$ corresponds to y value.
sin$\frac{2\pi}{3}$ = $\frac{\sqrt 3}{2}$
b.)Sine is an odd function, so sin(-t) = -sin t.
sin-$\frac{2\pi}{3}$ = - sin$\frac{2\pi}{3}$ = -$\frac{\sqrt 3}{2}$
