Упрастите выражение: sin(α-β)-sin(п/2-α)sin(-β)

1 вариант sin(alpha-beta)-sin(пи/2-alpha)*sin(-beta) sin(alpha)*cos(beta) (sin(beta+alpha)-sin(beta-alpha))/2  2 вариант sin(alpha-beta)-sin(пи/(2-alpha))*sin(-beta) (-cos(alpha)-sin(пи/(alpha-2)))*sin(beta)+sin(alpha)*cos(beta) sin(alpha)*cos(beta)-(cos(alpha)+sin(пи/(alpha-2)))*sin(beta) sin(alpha)*cos(beta)-(cos(alpha)+sin(пи/(alpha-2)))*sin(beta) (cos(alpha*beta/(alpha-2)-2*beta/(alpha-2)+пи/(alpha-2))-cos(alpha*beta/(alpha-2)-2*beta/(alpha-2)-пи/(alpha-2))-2*sin(beta-alpha))/2