3 public questions tagged with this topic.
The trick is after simplifying, 4 sq. unit is left. The method is simple: formula → substitution → calculation → answer.
Ref: NCERT Mathematics Class XII — Integrals
In easy words, solving fully: apply relevant formula, put numbers, compute. Result comes as 8 square units. Easy verification shows it satisfies condition.
Ref: NCERT Mathematics Class XII — Integrals
Look at it this way: using formula we get Continuous and f(1) = 5. Calculation gives this directly, check steps: apply rule, substitute values, simplify to get Continuous and f(1) = 5.
Ref: NCERT Mathematics Class XII — Matrices and Determinants
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