1 . y=1+x2

• A. $\frac{2x}{1+x^2}$
• B. $2x\left(1+x^2\right)$
• C. $\frac{1+x^2}{2x}$
• D. $\frac{1}{2x\left(1+x^2\right)}$

Answer: Option B

Explanation: