Find the cosine of the angle between A and B with respect to the standard inner product on M22.

A =\begin{bmatrix} 4 &3 \\ 1 &-1 \end{bmatrix}and B =\begin{bmatrix} 4 &3 \\ 3 &0 \end{bmatrix}

Carry out all calculations exactly and round to 4 decimal places the final answer only.

cos ? =