Answer
(a) $0.9716 $
(b) $\frac{\pi}{3} $
Work Step by Step
(a) Given $sin(s)=0.8258$ with $s\in[0,\frac{\pi}{2}]$, we have $s=asin(0.8258)\approx0.9716 $
(b) Given $cos(s)=\frac{1}{2}$ with $s\in[0,\frac{\pi}{2}]$, we have $s=acos(\frac{1}{2})=\frac{\pi}{3} $
