Question

Sin(arccos(1/3)+arccos(2*sqrt(2)/3)

Answer 1

$arccosfrac{1}{3}=x\ cosx=frac{1}{3}\ sinx=sqrt{1-frac{1}{9}}=frac{sqrt{8}}{3}\ sin(arccosfrac{1}{3})=frac{sqrt{8}}{3}\\ frac{sqrt{8}}{3}+ arccosfrac{2sqrt{2}}{3}$