Nghiệm của phương trình cos^2 x - căn 3 sin2x = 1 + sinx^2 là

A. $k\mathrm{\pi }, \mathrm{k}\in \mathrm{\mathbb{Z}} \mathrm{hoặc} -\frac{\mathrm{\pi }}{3}+\mathrm{k}2\mathrm{\pi }, \mathrm{k}\in \mathrm{\mathbb{Z}}$

B. $k\mathrm{\pi }, \mathrm{k}\in \mathrm{\mathbb{Z}} \mathrm{hoặc} \frac{\mathrm{\pi }}{3}+\mathrm{k\pi }, \mathrm{k}\in \mathrm{\mathbb{Z}}$

C. $k\mathrm{\pi }, \mathrm{k}\in \mathrm{\mathbb{Z}} \mathrm{hoặc} -\frac{\mathrm{\pi }}{3}+k2\pi , \mathrm{k}\in \mathrm{\mathbb{Z}}$

D. $k\mathrm{\pi }, \mathrm{k}\in \mathrm{\mathbb{Z}} \mathrm{hoặc} -\frac{\mathrm{\pi }}{3}+\mathrm{k\pi }, \mathrm{k}\in \mathrm{\mathbb{Z}}$