For the graph of a circular function y = f(x), determine whether f(-x) = f(x) or f(-x) = -f(x) is true.
-$\cos ^ { 2 } 4 x - \sin ^ { 2 } 4 x$
A) $\cos 4 x$
B) $2 \sin 4 x$
C) $\frac { 1 } { 2 } \sin 16 x$
D) $\cos 8 x$

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The Answer of For the graph of a circular function y = f(x), determine whether f(-x) = f(x) or f(-x) = -f(x) is true.
-$\cos ^ { 2 } 4 x - \sin ^ { 2 } 4 x$
A) $\cos 4 x$
B) $2 \sin 4 x$
C) $\frac { 1 } { 2 } \sin 16 x$
D) $\cos 8 x$

For the Graph of a Circular Function Y = F(x) cos⁡24x−sin⁡24x\cos ^ { 2 } 4 x - \sin ^ { 2 } 4 xcos24x−sin24x

For the Graph of a Circular Function Y = F(x) $\cos ^ { 2 } 4 x - \sin ^ { 2 } 4 x$