Let α , β ∈ R be such that lim x → 0 ⁡ x 2 sin ⁡ β x α x - sin…

Let α,βR be such that limx0x2sinβxαx-sinx=1. Then 6α+β equals

Solution

If α1, then limx0xsinβxαx-sinxx=0
α=1
limx0βx3sinβxβxx3x-sinxx3=β16

Using,limx0x-sinxx3=16 &limx0sinxx=1
6β=1β=16
6α+β=7

 

Asked in: JEE Advanced 2016 (Paper 1)

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