5) Cousider the following weird instwment. Three strings of same \( \mu \) are attached to a circular orim as shows. The connection kuot is marsless, the radius of the strings are \( R \) and shey all are under the seme tension. Points A, B, C are kept fixed. Cousider only motion of the strings aloug \( \hat{k} \) direction.
Find the fondamental frequencies of ohis instwment.