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