Find the Exact Value Of $\sin \left( \frac { 7 \pi } { 4 } \right)$

question 62

Essay

Find the exact value of $\sin \left( \frac { 7 \pi } { 4 } \right)$ and $\cos \left( \frac { 7 \pi } { 4 } \right)$ .

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Definitions:

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