Find the Exact Value Without Using a Calculator $$\sin \frac { 3 \pi } { 4 }$$

Multiple Choice

Find the exact value without using a calculator.
- $$\sin \frac { 3 \pi } { 4 }$$

A) $\frac { 1 } { 2 }$
B) $- \frac { 1 } { 2 }$
C) $- \frac { \sqrt { 2 } } { 2 }$
D) $\frac { \sqrt { 2 } } { 2 }$