3 public questions tagged with this topic.
In easy words, using formula we get 3. Calculation gives this directly, check steps: apply rule, substitute values, simplify to get 3.
Ref: NCERT Mathematics Class XI and XII
Recall the rule after simplifying, -2 < k < 2 is left. The method is simple: formula → substitution → calculation → answer.
Ref: NCERT Mathematics Class XI — Sets, Relations and Functions
Applying the basic concept, complete solution: write formula, plug data, do arithmetic. Final value matches exactly one local minimum in (0, 1). Simple and accurate.
Ref: NCERT Mathematics Class XI and XII
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