]> $$T\left(h,a\right)=\frac{1}{\left(2\pi \right)}{\int }_0^a\frac{\exp \{-\frac{1}{2}{h}^2\left(1+x^2\right)\}}{\left(1+x^2\right)}dx;\left(-\infty <h,a<+\infty \right)$$