Trigonometry (11th Edition) Clone

$1.108230308$
$y=$arccos $0.44624593=\cos^{-1} 0.44624593$ Ensuring that the calculator is in radians, we type $\cos^{-1} 0.44624593$ into the calculator and solve: $\cos^{-1} 0.44624593\approx1.108230308$ Therefore, $y=$arccos $0.44624593\approx1.108230308$.