Find all solutions of the equation sec4x2=0.\displaystyle {\sec{{4}}}{x}-{2}={0}.
The answer is A+k2π\displaystyle {A}+{\frac{{{k}}}{{{2}}}}\pi and B+k2π\displaystyle {B}+{\frac{{{k}}}{{{2}}}}\pi where k\displaystyle {k} is any integer and 0<A<B<π2\displaystyle {0}<{A}<{B}<\frac{\pi}{{2}},
A=\displaystyle {A}=   ,
B=\displaystyle {B}=   .