삼각비의 활용($\overline{\mathrm{AB}}=5$, $\overline{\mathrm{AC}}=4$, $\angle A=60^\circ$)(Application of Trigonometric Ratio($\overline{\mathrm{AB}}=5$, $\overline{\mathrm{AC}}=4$, $\angle A=60^\circ$))

알림 (Notice)