exam Maths Puzzle Numerical Ability

Find polynomials f(x), g(x), and h(x), if they exist, such that for all x,

/f(x)/-/g(x)/+h(x)={-1 if x<-1
{3x+2 if -1<or=x<or=0
{-2x+2i

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exam Other Question

Simplify the expression.
Cos(2arctan(x))


arctan is just the inverse of tan Example tan^-1

i keep getting (1-x^2)/(1+x) althoutgh it keeps saying that its wrong
3x+2y-2=8
-3x+4y+5z=-14
x-3y+4z=-14