\[\int\limits_a^b {\frac{{f(x)dx}}{{f(a + b - x) - f(x)}} = \frac{{b - a}}{2}} \]
\[\int {{e^{ - (a + bt)}}} *\sin (wt + c) =\\ - \frac{{{e^{ - (a + bt)}}*\sin (wt + c + \arctan \frac{w}{b})}}{{\sqrt {{b^2} + {w^2}} }}\]
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