exam Maths Puzzle Numerical Ability

please help me solve :
2x-1 divided by 6x to the 3power + x to the 2power +0x+1

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exam Other Question

The selling price for one computer keyboard is $17.00. The total cost (in dollars) to produce x keyboards is given by C(x)=6x+40. Assuming the keyboard manufacturer can sell all un 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