Calculus 3

Calculus Level pending

\[\large \int _{-\infty} ^\infty \frac {e^{(1998+2016i)x}}{\cosh (x)} \, dx = \frac \pi { \cosh ((ai-b) \pi)} \]

If the equation above holds true for real \(a\) and \(b\), find \(a+b\).

\(\)

Notation: \(i=\sqrt{-1}\) denotes the imaginary unit.

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