3.ii.after multiplying each term of first bracket frm second one and then subracting second from first.. Ans comes: x-1/x..
Actually my camera was not working..
Hope u got it..
4.vi a6 - b6
=(a3) 2-(a3) 2
=(a3+a3) (a3-a3)
=(a3+a3)(a2+b2-ab) (a3+a3)(a2+b2+ab)