Q.
fx=lnx2+exlnx4+e2x, Then limx→∞f(x) is equal to
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a
1
b
12
c
2
d
none of these
answer is B.
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Detailed Solution
L= limx→∞ lnx2+exlnx4+e2x=limx→∞ ln ex1+x2exln e2x1+x4e2x = limx→∞ x+ln1+x2ex2x+ln 1+x4e2x = limx→∞ 1+1x ln 1+x2ex2+1x ln 1+x4e2xNote that as x→∞, x2ex→0 and as x→∞, x2e2x→0 Using L 'Hospital's ruleHence L=12.
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