exam Maths Puzzle Numerical Ability

Hi, I need help solving this problem on reducing rational expressions:

x^2-2xy+y^2/x^2-y^2

Thanks!

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exam Other Question
Simplify by removing factors of 1.

m^2-4 / (m+2)^2

This should look like a fraction. please solve factor and simplify
x^2+3-18/x^2-36