The value of $$\frac{p^2 - (q - r)^2}{(p + r)^2 - q^2} + \frac{q^2 - (p - r)^2}{(p + q)^2 - r^2} + \frac{r^2 - (p - q)^2}{(q + r)^2 - p^2}$$ is​

We can find the value of the expression by letting the values of p, q and r.

Putting p = q = r = 1

=$$\frac{1}{3}+\frac{1}{3}+\frac{1}{3}$$

= 1

Thus, the value of the expression is 1.