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Find the Exact Value cos⁡2(π/8)−sin⁡2(π/8)\cos ^ { 2 } ( \pi / 8 ) - \sin ^ { 2 } ( \pi / 8 )

Question 7

Essay

Find the exact value. cos⁡2(π/8)−sin⁡2(π/8)\cos ^ { 2 } ( \pi / 8 ) - \sin ^ { 2 } ( \pi / 8 )

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