Question:
how can we know where to substitute the x value directly and where to we shouldn't in limits
Answer:
Whenever, we can see some mathematical expression, where on putting the values we are getting some undefined or 0/0 form or anything/0 form infinity, then we avoid putting it direct.
For more details, try to solve NCERT questions, and for reference and understanding check on the link below: Timestamp: 08:11
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