Find the general solution for each of the following equation $\sec^22x=1-\tan 2x$

Question

$\begin{array}{1 1}(A)\;x=\large\frac{n\pi}{2}+\frac{3\pi}{8}&(B)\;x=\large\frac{n\pi}{3}+\frac{3\pi}{8}\\(C)\;x=\large\frac{n\pi}{3}+\frac{5\pi}{8}&(D)\;x=\large\frac{2n\pi}{5}+\frac{3\pi}{8}\end{array}$