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) $\cos ^ { 4 } 4 \alpha - \sin ^ { 4 } 4 \alpha$

Question

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) $\cos ^ { 4 } 4 \alpha - \sin ^ { 4 } 4 \alpha$

Quizplus · Accepted Answer

The Answer is B

Evaluate the Expression cos⁡8α\cos 8 \alphacos8α A) cos⁡44α+sin⁡44α\cos ^ { 4 } 4 \alpha + \sin ^ { 4 } 4 \alphacos44α+sin44α

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