if sin4A/a +cos4A/b=1/a+b prove that.. sin8A/a3+ cos8A/b3=1/(a+b)3 Share with your friends Share 0 Priyanka Kedia answered this 53 View Full Answer Trupti answered this refer R D SHARMA 0 Enrique Iglesias answered this RD sharma is best 0 Ahmad answered this proof of similar question 0