Question 11Let $ABC$ be a triangle satisfying the following conditions that $\angle A+\angle C=2\angle B$, and $\dfrac1{\cos A}+\dfrac1{\cos C}=\dfrac{-\sqrt2}{\cos B}$. Determine the value of $\dfrac{2022\cos\left(\frac{A-C}{2}\right)}{\sqrt2}$.