Trigonometry 7th Edition

Given expression = -2 $\sin( y + 45^{\circ})$ = -2 $\sin( 45^{\circ} + 45^{\circ})$ ( replacing y with $45^{\circ}$) = -2 $\sin90^{\circ}$ = -2$\times (1)$ ( substituting for exact value of $\sin 90^{\circ}$) = - 2