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a
12
b
-12
c
−13
d
13
answer is B.
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Detailed Solution
limx→-∞ x2sin1xx4-1x+1x2=limx→-∞ -sin1x1x 4-1x+1x2 (as x→-∞ x=-x)plug in x=1y in the given limitlimy→0−sinyy4y2−1y+1=limy→0−1y2−y+4 limy→0sin y y=−14=−12