Convert the Expression $$\cos 4 \alpha$$ ​
A)​ $\cos ^ { 2 } 2 \alpha - \sin ^ { 2 } 2 \alpha$

Convert the expression.​ $$\cos 4 \alpha$$ ​

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

Correct Answer:

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