book Maths Puzzle Numerical Ability

How do you factor this?

y/y+2 - 1/Y^2+2y

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book Other Question

Solve each equation for all values of theta. the problem is sin(theta/2)
plus cosine(theta/2)= sqrt(2) The 3rd equation was stated there it is

f(2)=-1/2

I completed the first part of each of the functions but got stuck with the elimination part....please help