If x and y are real nos. not equal to zero, show that
The book hinted that binomial thingy (maybe expansion, I forgot) may be used.
BTW, please teach me how to use that \frac, \leq, etc.
Ah. Thank you for the proper syntax.
So this is the question
The book farther hinted that you may let then use the binomial expansion
And BTW, if you know another solution, please post it even though it doesn't follow the book's solution.