If l=limx→−2 tanπxx+2+limx→∞ 1+1x2xthen which one of the following is not correct?
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a
l>3
b
l>4
c
l<4
d
I is a transcendental number
answer is C.
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Detailed Solution
We have,l=limx→−2 tanπxx+2+limx→∞ 1+1x2x⇒ l=limx→−2 tan(2π+πx)x+2+limx→∞ 1+1x2x⇒ l=πlimx→−2 tanπ(x+2)π(x+2)+elimx→∞ xx2=π+e0=π+1 So, option (c) is incorrect.