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
1) how do you write in slope-intercept form of the line that passes through (6,-13) and is perpendicular to the graph 2x-9y=5?


2) (-3,1), y=1/3x+2



3) (6,-1), 3y+x=3 1)12xy^2-108x

2)3a^3b^2+81b^2

3)3x^4-48

4)2x^4+x^2-3