3 public questions tagged with this topic.
From the definition, after simplifying, 7 is left. The method is simple: formula → substitution → calculation → answer.
Ref: NCERT Mathematics Class XII — Matrices and Determinants
The trick is we verify 12 by full calculation: use standard identity, substitute, simplify step by step to reach 12.
Ref: NCERT Mathematics Class XII — Probability
Look at it this way: we verify 3 by full calculation: use standard identity, substitute, simplify step by step to reach 3.
Ref: NCERT Mathematics Class XII — Probability
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