If tan α and tan ß are two solutions of ${\mathrm{x}}^2-\mathrm{px}+\mathrm{q}=0,$ $\mathrm{cot\alpha }\mathrm{and}\mathrm{cot\beta }$ are the roots of ${\mathrm{x}}^2-\mathrm{rx}+\mathrm{s}=0$ then the value of $rs$ is equal to