If A = [cos θ, i sin θ; i sin θ, cos θ],(θ=(π)/24) and A^5= [a, b; c, d], where i=√ -1, then which one of the following is not true?

If $\displaystyle \mathrm{A}=\left[\begin{array}{cc}\cos \theta & i \sin \theta \\ i \sin \theta & \cos \theta\end{array}\right],\left(\theta=\frac{\pi}{24}\right)$ and $\displaystyle \mathrm{A}^5=\left[\begin{array}{ll}\mathrm{a} & \mathrm{b} \\ \mathrm{c} & \mathrm{d}\end{array}\right]$, where $\displaystyle i=\sqrt{-1}$, then which one of the following is not true ?