a)tg45° = 1
sin 30° = 0.5
Виет:
{x1+x2 = -p
{x1•x2 = q
1+0.5 = 1.5
1•0.5 = 0.5
тогда, y = x²-1.5x+0.5
б)cos 60° = 1/2
sin 45° = ✓2/2
1/2+✓2/2 = (✓2+1)/2
1/2 • ✓2/2 = 1/2✓2
y = x²-(✓2+1)x/2 + 1/2✓2
