A block of mass `m` is attached to one end of a light inextensible string passing over a smooth light pulley `B` and under another smooth light pulley `A` as shown in the figure. The other end of the string is fixed to a ceiling. `A` and `B` are held by spring of spring constants `k_(1)` and `k_(2)`. Find angular frequency of small oscillations of small oscillations of the system.