Question Number 116990 by Bird last updated on 08/Oct/20
$${let}\:{A}\:=\begin{pmatrix}{\mathrm{1}\:\:\:\:\:\:\:\:−\mathrm{1}}\\{\mathrm{2}\:\:\:\:\:\:\:\:\:\:\:\:\mathrm{3}}\end{pmatrix} \\ $$$$\left.\mathrm{1}\right)\:{calculate}\:{A}^{{n}} \\ $$$$\left.\mathrm{2}\right)\:{determine}\:{cosA}\:{and}\:{chA} \\ $$$$\left.\mathrm{3}\right){determine}\:{sinA}\:{and}\:{shA} \\ $$