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Question

limx0asinxbx+cx2+x32x2log(1+x)2x3+x4 exists and is finite, then

A
a=b
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B
c=0
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C
a=6
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D
c=2
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Solution

The correct options are
A a=b
B c=0
C a=6
limx0a(xx36+x5120....)bx+cx2+x32x2(xx22+x33.........)2x3+x4

=limx0(ab)x+cx2+(1a/6)x3+ax5/120+...2x5/3x6/2+...

For this limit to exist we must have ab=0,c=0, and 1a/6=0, that is, a=b=6 and c=0.

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