In the expansion of (x+a)n, if the sum of odd terms P and sum of even be Q, prove that (i) P2-Q2 = (x2-a2)n. (ii) 4PQ= (x+a)2n- (x-a)2n.
In the expansion of (x+a)n, if the sum of odd terms P and sum of even be Q, prove that (i) P2-Q2 = (x2-a2)n. (ii) 4PQ= (x+a)2n- (x-a)2n.