Answer
- 2
Work Step by Step
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
