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please solve this que and send me whole solution

please solve this que and send me whole solution

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Grade:12th pass

1 Answers

ng29
1698 Points
9 years ago
for these type of questions best approach is SERIES EXPANSION  the answer will be 3 
as u expand the series of cosx and ex and multiply the atarting coefficient u get x3 and then so on but we consider only first term and value of limit is given finite so value of n=3  so that it can cancel the upper x3 and make the value of limit finite.  
approve if useful

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