Practicing Success

Target Exam

CUET

Subject

-- Mathematics - Section B1

Chapter

Inverse Trigonometric Functions

Question:

The solution of the inequality $\log_{1/2} \sin^{-1}x>\log_{1/2}\cos^{-1}x$ is:

Options:

$x∈[0,\frac{1}{\sqrt{2}}]$

$x∈(\frac{1}{\sqrt{2}},1]$

$x∈[0,\frac{1}{\sqrt{2}})$

None of these

Correct Answer:

None of these

Explanation:

$\sin^{-1}x<\cos^{-1}x;\sin^{-1}x<\frac{π}{2}-\sin^{-1}x$

$⇒\sin^{-1}x<\frac{π}{4}⇒0<x<\frac{1}{\sqrt{2}}$; Also, $\sin^{-1}x>0$