Evaluate the Expression $$\cos 8 \alpha$$ A) $\cos ^ { 4 } 4 \alpha + \sin ^ { 4 } 4 \alpha$

question 49

Multiple Choice

Evaluate the expression. $$\cos 8 \alpha$$

• A) \(\cos ^ { 4 } 4 \alpha + \sin ^ { 4 } 4 \alpha\)
• B) \(\cos ^ { 2 } 4 \alpha - \sin ^ { 2 } 4 \alpha\)
• C) \(\cos ^ { 2 } 4 \alpha + \sin ^ { 2 } 4 \alpha\)
• D) \(\cos ^ { 4 } 4 \alpha - \sin ^ { 2 } 4 \alpha\)
• E) \(\cos ^ { 4 } 4 \alpha - \sin ^ { 4 } 4 \alpha\)

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