TeX source:

\left(c_{h}+\alpha c_{1}\right)\left[\int_{x}^{y}\left\{\frac{e^{\alpha(t-x)}-1}{\alpha}\right\} D(t) d t-\frac{1}{2 p}\left\{\int_{x}^{y} e^{\alpha(t-x)} D(t) d t\right\}^{2}\right]