## Calculus: Early Transcendentals (2nd Edition)

$\sqrt 3/2$
Let's glance at our unit circle. A quick glance tells us the answer is $\sqrt 3/2$ Let's check with the calculator. Change the mode to radian, press (SIN) then (2), (π), (÷), (3). You'll have your answer of 0.86603 or $\sqrt 3/2$.