3
1)2x³/3|2-1=16/3-2/3=14/3=3 2/3
2)-1/2x²|3-2=-1/18+1/8=(-4+9)/72=5/72
3)1/2sin2x|ππ/2-0=1/2(sinπ-sin0)=0
4)-cosx|π-π/2=-cosπ+cosπ/2=1
4
x²+x-6=0
x1+x2=-1 U x1*x2=-6⇒x1=-3 U x2=2
S(-x²-x+6)dx=-x³/3-x²/2+6x|2-(-3)=-8/3-2+12-9+9/2+18=
=19+(-16+27)/6=19+11/6=20 5/6