Let \(x= \ln \tan \dfrac \theta2\) and given that \(y= \tan \theta - \theta\). Determined \(\frac{{d}^{2}y}{dx^{2}}\) if can be expressed in the form \(A \tan B\theta . C \sin D\theta(E \sec^{F} G\theta+H)\). Compute \(A+B+C+D+F+G+H\).

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