Please solve the following problem "": Share with your friends Share 0 Roopam Pandey answered this Dear student,we know thatIn any △ABCcosA= b2+c2-a2 2bc , cosB=a2+c2-b2 2ac andcosC=b2+a2-c22abnowcosAa+cosBb+cosCc=b2+c2-a2 2abc+a2+c2-b2 2abc+b2+a2-c22abc=a2+b2+c22abcsince a2, b2and c2 are roots of equation x3-Px2+Qx-R=0sum of the rootsa2+b2+c2=--P1=Palso producta2b2c2=--R1=Rabc=Ra2+b2+c22abc=P2RRegards 0 View Full Answer
