1.4.27 Matrix Transformations

\ (\ Underline {\ Mathrm {y} _ {\ text {Sliding:}} \) Calculate the value of the function from the matrix. \ [\ cos \ left (\ frac {\ pi} {2} a \ right), \ quad \ text {where} A = \ LEFT (\ Begin {Array} {CCC} 1 & 1 \\ -8 & -5 &4 \\ 4 & 2 & 2 & 2 & 2 & 1 \ end {Array} \ Right) \]