exam Maths Puzzle Numerical Ability

How do you simplify completely this complex fraction?

[(a+1/a-1)+1 / (a+1/a-1)-1]^5

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exam Other Question

X2+x+3 4X +3
______ + ______
X+2 x+2 Make f the subject from the following equation v=u+ft/m. If someone could help I would be grateful. thanks