8.4: 37 37. For which of the following series is the Ratio Test inconclusive (that is, it fails to give a definite answer)? 1 (a) E (b) E 2" 3 n=1 N° n=1 (-3)"-1 ( c) Σ 00 00 (d) Σ 1 + n² n=1 n=1

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A: Use the substitution √(x+1)=t, you will get your solution.

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A: we will solve this using L'Hospitals rule. 

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A: Topic:- trigonometry ratios  

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A: I am attaching image so that you understand each and every step.

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A: I have stated the used formulas in the solution.

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A: This question can be solved by applying the formula of 2.cosA.cosB

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A: Topic:- function   

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