Check that the fundamental roots $mu^{i}$ satisfy $$2 frac{alpha^{i} cdot mu^{j}}{left(alpha^{i} ight)^{2}}=delta^{i j}$$

Check that the fundamental roots $\mu^{i}$ satisfy

$$2 \frac{\alpha^{i} \cdot \mu^{j}}{\left(\alpha^{i}\right)^{2}}=\delta^{i j}$$