MadeEasy Test Series: Calculus - Limits

Question

How it solve this ?

Comments

Can you explain that a+b+1=0 part? If the

Answer 1

CHECK ATTACHMENT HOW TO SOLVE THIS ANSWER  (C)

Comments

PLEASE explain me 2nd step

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@mohitbawankar cosx ka expansion likha hai na usko hi expand kiya hai  phle cos x ki jaga cos 4x hai toh x i jaga 4x rakha than expand kia same with cos(2x)  and  O(6) mtlb x^6 wo required ni hai apanko  islie expand ni kia

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sumit goyal 1 i applied  L'Hôpital's rule and according to that i am getting finite value from all the options :/

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bhai solve karke pic daal aise kaise btau upload karo @Mk Utkarsh

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@Mk Utkarsh l hospital rule  0/0 pe lagta idhar to hai ni wo case  you cannot apply

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acha ok :)

Answer 2

Another approach for question (If you don't remember Cos expansion)