Question
If $\int\limits^{\text{a}}_0\frac{1}{4+\text{x}^2}\text{dx}=\frac{\pi}{8}$, find the value of a.
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$ \begin{pmatrix} \text{3x + y}&\text{-y} \\ \text{2y - x}&\text{3} \\ \end{pmatrix}= \begin{pmatrix} \text{1}&\text{2} \\ \text{-5}&\text{3} \\ \end{pmatrix}.$