Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Continuity and Differentiability

Question:

$\underset{x→2}{\lim}\frac{(\cos α)^x+(\sin α)^x-1}{x-2}$ is equal to

Options:

$(\cos α)^2+(\sin α)^2$

0

none of these

Correct Answer:

none of these

Explanation:

$\underset{x→2}{\lim}\frac{(\cos α)^x+(\sin α)^x-1}{x-2}=\underset{x→2}{\lim}\frac{(\cos α)^x\log_e(\cos α)+(\sin α)^x\log_e(\sin α)}{1}$

Using L’Hospital rule

$=\cos^2α(\log_e\cos α)+\sin^2α\log_e(\sin α)$