3 public questions tagged with this topic.
Here's the idea in simple terms: we verify 10 by full calculation: use standard identity, substitute, simplify step by step to reach 10.
Ref: NCERT Mathematics Class XII — Linear Programming
Notice that using formula we get -633. Calculation gives this directly, check steps: apply rule, substitute values, simplify to get -633.
Ref: NCERT Mathematics Class XI and XII
We can see that complete solution: write formula, plug data, do arithmetic. Final value matches 1. Simple and accurate.
Ref: NCERT Mathematics Class XII — Applications of Derivatives
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