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Find the Exact Value Of sin⁡(7π4)\sin \left( \frac { 7 \pi } { 4 } \right)

Question 62

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Find the exact value of sin⁡(7π4)\sin \left( \frac { 7 \pi } { 4 } \right) and cos⁡(7π4)\cos \left( \frac { 7 \pi } { 4 } \right) .

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