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Q.

 Limx0axex - blog(1+x)+cx.e-xx2 sinx=2  are given
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a

a=3, b=12, c=9

b

a=-3, b=12, c=9

c

a=3, b=12, c=-9

d

a=-3, b=12, c=-9

answer is A.

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Detailed Solution

Ltx0a x ex - b log(1+x)+cx e-xx2 sin x=2 Ltx0 ax1+x1!+x22!+x33!+...            -bx-x22+x33-x44+...        +Cx1-x1+x22!-x33!+x44!....                                x3

Dr  0 Coef of x, Coef of x2 terms are zero a-b+c=0     -(1) a+b2-c=0  2a+b-2c=0          -(2) a2-b3+c2=2  3a-2b+3c=12     -(3) solving (1), (2) and (3) a=3, b=12, c=9

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