Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Continuity and Differentiability

Question:

If $y=e^{{x + e}^{{x + e}^{{x+....+∞}}}}$ then $\frac{dy}{dx}=$

Options:

$\frac{x}{1-x}$

$\frac{1-x}{x}$

$\frac{y}{1-y}$

$\frac{1-y}{y}$

Correct Answer:

$\frac{y}{1-y}$

Explanation:

The correct answer is Option (3) → $\frac{y}{1-y}$

$y=e^{{x + e}^{{x + e}^{{x+e}^{...+∞}}}}=y=e^{x+y}$

$\log y = x+y$

differentiating wrt x

$\frac{1}{y}\frac{dy}{dx}=1+\frac{dy}{dx}$

so $\frac{dy}{dx}=\frac{y}{1-y}$