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Question: Answered & Verified by Expert
If limx03+αsinx+βcosx+loge(1-x)3tan2x=13, then 2α-β is equal to :
MathematicsLimitsJEE MainJEE Main 2024 (27 Jan Shift 2)
Options:
  • A 2
  • B 7
  • C 5
  • D 1
Solution:
1533 Upvotes Verified Answer
The correct answer is: 5

Given,

limx03+αsinx+βcosx+loge(1-x)3tan2x=13

limx03+αx-x33!++β1-x22!+x44!+-x-x22-x333tan2x=13

limx0(3+β)+(α-1)x+-12-β2x2+.3x2×x2tan2x=13

The coefficient of all the powers of x except x2 is 0.

β+3=0,α-1=0 and -12-β23=13

β=-3,α=1

2α-β=2+3=5

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