[@sbb2018]

Great sir

[@lakhanyadav5347]

Nice sir

[@MindyourBRAIN1]

Thanks and welcome

[@ABCD-bm2hs]

Simple but good one thanks for revise the previous concept ❤

[@MindyourBRAIN1]

Most welcome 😊

[@badalraj2011]

1:57 wow🎉

[@nomeaculpa8041]

(x+y)^2-(x-y)^2=x^2+2xy+y^2-x^2+2xy-y^2=4xy 4×105=420

[@ArkoRoy-y7g]

That should be x‍^2 and y^2=(x-y)(x+y)