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TS EAMCET · Maths · Inverse Trigonometric Functions

If sin-1x<cos-1x, then

  1. A -1x<12
  2. B -3x<-1
  3. C 12<x1
  4. D 1<x<3
Verified Solution

Answer & Solution

Correct Answer

(A) -1x<12

Step-by-step Solution

Detailed explanation

Given, sin-1x<cos-1x ⇒cos-1x>π2-cos-1x sin-1x+cos-1x=π2 ⇒2cos-1x>π2 ⇒cos-1x>π4 ⇒x<cosπ4 (As cosθ is decreasing function.) ⇒x<12  ……1 Domain of cos-1θ is…
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