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)

in the reason i think u shud have meant |sinx| <=1..

well..

the assertion  n reason r true...but i think the reason does not explain the assertion

2)..solve using complex numbers wid euler's theorem