## Trigonometry 7th Edition

Given expression = 3 $\sin2y$ = 3 $\sin2 (45^{\circ})$ ( replacing $y$ with $45^{\circ}$) = 3 $\sin90^{\circ}$ = 3 $\times (1)$ ( substituting exact value of $\sin 90^{\circ}$) = 3