1 assertion   the max and min value of 5cosx+3cos(x+(pi/3))+3 lies b/w -4 and 10

   reason  domain of sinx,cosx belongs to R and|sinx|<- 1 ,|cosx|<-1

2 assertion the value of (sigma(cos rpi/3 whole cube)) =-1/8

reason (its cos 10pi/3 and -1/2)

plz ans at the earliest

1)if a+b+c=0 then the equation 3ax^2 +2bx+c has in the interval(0,1)

a at least one root       b at the most one root      c no root          d none of these

2)if 27a+9b+3c+d=0   then the equation  4ax^3+3bx^2+2cx+d=0 has at least one root lying b/w

a  0 and 1        b 1and3        c 0and 3                    dnone of these

plz ans as soon as possible!!!!

rates for proper exp