Question

pomogiteeeeeeeeeeeee​

Answer 1

$frac{Sin(alpha+beta)*Sin(alpha-beta)}{Sinalpha+Sinbeta} =frac{Cos(alpha+beta-alpha+beta)-Cos(alpha+beta+alpha-beta)}{2(Sinalpha+Sinbeta)}=frac{Cos2beta-Cos2alpha}{2(Sinalpha+Sinbeta)}=frac{1-2Sin^{2}beta-1+2Sin^{2}alpha}{2(Sinalpha+Sinbeta)}=frac{2(Sin^{2}alpha-Sin^{2}beta)}{2(Sinalpha+Sinbeta) }=frac{(Sinalpha+Sinbeta)(Sinalpha-Sinbeta)}{Sinalpha+Sinbeta}=Sinalpha-Sinbeta$