Hello Shovraj
Do you mean this question https://www.teachoo.com/2327/597/Misc-4---If-x---iy-=-root-(a---ib)-(c---id)--prove-(x2---y2)2/category/Miscellaneous/ ?
Can you please click a photo of the question in the ncert?
Written on Nov. 28, 2017, 5:06 p.m.