Find an Algebraic Expression That Is Equivalent to the Expression $\cos ( \arcsin 4 x )$

Find an algebraic expression that is equivalent to the expression..​ $\cos ( \arcsin 4 x )$ ​

A) $\frac { \sqrt { 1 + 16 x ^ { 2 } } } { 1 + 16 x ^ { 2 } }$
B) $\frac { \sqrt { 1 - 16 x ^ { 2 } } } { 1 - 16 x ^ { 2 } }$
C) $\sqrt { 16 x ^ { 2 } - 1 }$
D) $\sqrt { 1 + 16 x ^ { 2 } }$
E) $\sqrt { 1 - 16 x ^ { 2 } }$

Correct Answer:

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