input 1...(x-y)(x+y)=2y(49x-y)...apparentlee teech giv this as gospel
but (x-y)(x+y)=x^2 -y^2=98xy -2y^2...teech giv this as gospel
problem is tu look at (x+y)^2...=x^2 +y^2 +2xy, so it =(x-y)*(x+y)+2xy+2y^2
so it =(98xy-2y^2) +2xy+2y^2
=100xy
######## amazing the lengths teech gotu just tu see if yukan figger it out