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Answer the following question:

Asked by nkrbasak 13th March 2013, 9:24 PM
Answered by Expert
I will recommend you solving it step by step and not just writing the formula. This formula is not recognized in the NCERT books, even though it is a valid one. And since, you will be giving board examinations and you never know who might be your evaluator, so I will not take the risk. It would take only 3-4 minutes of your additional time, but it can fetch you 2-3 more marks. So, yeah I would not write any formula that is not explicitly stated in NCERT books. 
Answered by Expert 14th March 2013, 6:04 AM
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