6.2 Trigonometric Functions: Unit Circle Approach/101

$f(\theta )=\sin(\theta )$

$\theta =60^{\circ }$ $f(2\theta )$

$f(2(60^{\circ })=120^{\circ }$

$f(2\theta )=f(2\cdot 60^{\circ })$

sin(120^\circ)= \frac{\sqrt{3}}{2}