## Trigonometry (10th Edition)

$\cos$(30$^{\circ}$ + 60$^{\circ}$) = $\cos$ 30$^{\circ}$ + $\cos$ 60$^{\circ}$ $\cos$(30$^{\circ}$ + 60$^{\circ}$) = $\cos$ 90$^{\circ}$ = 0$^{\circ}$ $\cos$ 60$^{\circ}$ = $\frac{1}{2}$ $\cos$ 30$^{\circ}$ = $\frac{\sqrt 3}{2}$ $\cos$ 30$^{\circ}$ + $\cos$ 60$^{\circ}$ = $\frac{\sqrt 3}{2}$ + $\frac{1}{2}$ = $\frac{\sqrt3 + 1}{2}$ 0$^{\circ}$ $\ne$ $\frac{\sqrt3 + 1}{2}$ Therefore, the statement is false.