1. y'=-9x^2+12x+5
9x^2-12x-5>0
(6+-sqrt(36+45))/9=(6+-9)/9
x<-1/3 U x>5/3
2. 1*0+5(-1)+10*1/2=-5+5=0
cosA=0 A=П/2
1. y'=-9x^2+12x+5
9x^2-12x-5>0
(6+-sqrt(36+45))/9=(6+-9)/9
x<-1/3 U x>5/3
2. 1*0+5(-1)+10*1/2=-5+5=0
cosA=0 A=П/2