Use a double-angle formula or half-angle formula to simplify $\cos ^ { 2 } \frac { \pi } { 8 } - \sin ^ { 2 } \frac { \pi } { 8 }$ .

Name: Use a double-angle formula or half-angle formula to simplify $\cos ^ { 2 } \frac { \pi } { 8 } - \sin ^ { 2 } \frac { \pi } { 8 }$ .
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The Answer of Use a double-angle formula or half-angle formula to simplify $\cos ^ { 2 } \frac { \pi } { 8 } - \sin ^ { 2 } \frac { \pi } { 8 }$ .

Use a Double-Angle Formula or Half-Angle Formula to Simplify cos⁡2π8−sin⁡2π8\cos ^ { 2 } \frac { \pi } { 8 } - \sin ^ { 2 } \frac { \pi } { 8 }cos28π​−sin28π​

Use a Double-Angle Formula or Half-Angle Formula to Simplify $\cos ^ { 2 } \frac { \pi } { 8 } - \sin ^ { 2 } \frac { \pi } { 8 }$