Q.
If limx→0 1+xln1+b21/x=2bsin2θ, b>0 and θ∈(−π,π], then the value of θ, is
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a
±π4
b
±π3
c
±π6
d
±π2
answer is D.
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Detailed Solution
We have,limx→0 1+xln1+b21/x=2bsin2θ⇒ limx→0 xln1+b2x1x=2bsin2θ⇒ eln1+b2=2bsin2θ⇒ 1+b2=2bsin20⇒ sin2θ=1+b22b⇒ sin2θ=12b+1b ∵b+1b≥2∴12b+1b≥1⇒ sin2θ=1⇒ θ=±π2
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