Question

Differentiate:

f(x) = 2x-(x^2+1)^7 / 3

2-(2x)^6

Would it be 2-x / 3(x^2+1)^6 ?

Answer 1

I get
2 - (x^2+1)^6 (2x)/3

what is this second line? 2-(2x)^6

Answer 2

Well the answer choices are
f'(x) = 2-x / 3(x^2 +1)^6

f'(x)= 2/3 - 14/3x(x^2+1)^6

None of the above