\int \int \frac { ( z + t ) d z d t } { a ^ { 2 } + ( z + t ) ^ { 2 } }
Evaluate
\int \frac{\ln(\left(z+t\right)^{2}+a^{2})}{2}+С\mathrm{d}t
Differentiate w.r.t. z
\frac{\mathrm{d}}{\mathrm{d}z}(\int \frac{\ln(\left(z+t\right)^{2}+a^{2})}{2}+С\mathrm{d}t)
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