Giải phương trình 8.cos2x.sin2x.cos4x=- căn 2. x=pi/32+kpi/4; x=3pi/32+kpi/4

A. $x=\frac{\pi }{32}+k\frac{\pi }{4}; x=\frac{3\pi }{32}+k\frac{\pi }{4}\left(k\in \mathrm{\mathbb{Z}}\right)$

B. $x=\frac{\pi }{8}+k\frac{\pi }{8}; x=\frac{3\pi }{8}+k\frac{\pi }{4}\left(k\in \mathrm{\mathbb{Z}}\right)$

C. $x=-\frac{\pi }{32}+k\frac{\pi }{4}; x=\frac{5\pi }{32}+k\frac{\pi }{4}\left(k\in \mathrm{\mathbb{Z}}\right)$

D. $x=\frac{\pi }{16}+k\frac{\pi }{8}; x=\frac{3\pi }{16}+k\frac{\pi }{8}\left(k\in \mathrm{\mathbb{Z}}\right)$