Suppose That $g ( x , y ) = \cos ( A x + B y )$

Essay

Suppose that $g ( x , y ) = \cos ( A x + B y )$ .Find A and B if you know that the period of $g ( x , 0 )$ is $\frac { 2 \pi } { 11 }$ and the period of $g ( 0 , y )$ is $3$ .