1. The graph of  $y=acos(x+b)^{\circ}$  for $0⩽x⩽360$ is drawn on the grid below.

Given that $a>0$ and that 0</p><p style="line-height: 1.7" class="text-lg tracking-wide font-normal leading-relaxed">find the value of a and the value of \(b.

$\begin{matrix}a & = & ...................................\\b & = & ...................................\end{matrix}$