Question

If f(x) and g(x) are two functions with g(x) = $x-\frac{1}{x}$ and fog(x) = $x^3-\frac{1}{x^3}$ then f'(x) =

• A. $x^2-\frac{1}{x^2}$
• B. 3x2 + 3
• C. $1-\frac{1}{x^2}$
• D. $3x^2+\frac{3}{x^4}$

Answer 1

Answer: (B)

3x2 + 3

Answer 2

The correct answer is (B) : 3x2 + 3.