exam Maths Puzzle Numerical Ability

x+3=15/5

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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 Evaluate each function and simplify where possible.
a. g(-1) if g(x) = -x^2 - x
b. g(x) + 3 if g(x) = x^2 + x
c. h(x - 1) if h(x) = 3x - 2