If A - - cos - sin - -sin - cos - - then A2 -

Since A^2 = A.A = [ cos α amp; sin α; sin α amp; cos α ][ cos α amp; sin α; sin α amp; cos α ] = [ cos 2 α amp; sin 2 α; sin 2 α ...

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Multiplication of Matrices

If A = [ cos ...

Question

If $A = [\begin{matrix} c o s α & s i n α - s i n α & c o s α \end{matrix}]$ , then $A^{2} =$

$[\begin{matrix} c o s 2 α & s i n 2 α s i n 2 α & c o s 2 α \end{matrix}]$

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$[\begin{matrix} c o s 2 α & - s i n 2 α s i n 2 α & c o s 2 α \end{matrix}]$

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$[\begin{matrix} c o s 2 α & s i n 2 α - s i n 2 α & c o s 2 α \end{matrix}]$

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$[\begin{matrix} - c o s 2 α & s i n 2 α - s i n 2 α & - c o s 2 α \end{matrix}]$

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