\[{{}_{2}H_{2}}\left({a,b\atop c,d};1\right)=\frac{\Gamma\left(c\right)\Gamma%
\left(d\right)\Gamma\left(1-a\right)\Gamma\left(1-b\right)\Gamma\left(c+d-a-b-%
1\right)}{\Gamma\left(c-a\right)\Gamma\left(d-a\right)\Gamma\left(c-b\right)%
\Gamma\left(d-b\right)},\]