## Trigonometry 7th Edition

$\sin (- 120)^{\circ}$ = - 0.8660
Using calculator in degree mode- (- 120) → $\sin$ $\sin (- 120)^{\circ}$ = - 0.8660254038 Rounding it to four places past the decimal point- $\sin (- 120)^{\circ}$ = - 0.8660