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Dear himank
If the function is define at that point in which point u are finding the limit then u can find it directlt as an example given by u
x=3 is in the domain of function 3x^2-4x-10 so u can find by direct .
but if the function is not define at the point where u are finding the limit then u can't use the direct method
such as f(x) = (x2-x )/x tis function is not define at x=0
so u can't find limit by just direct putting.
in this case u have to take common x and then u can put the value x=0
Please feel free to post as many doubts on our discussion forum as you can.If you find any question Difficult to understand - post it here and we will get youthe answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation.All the best. Regards,Askiitians ExpertsBadiuddin
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