Given the question limx→0+xsin(x)
I have deducted so far that this has the indeterminate form 00 so I have taken the natural logarithm of both sides to give me: limx→0+ln(y)=limx→0+sin(x)ln(x) This still has an indeterminate form so I rearrange it to start using L'hospitals rule: limx→0+ln(x)csc(x) =limx→0+1x−csc(x)cot(x) =limx→0+−sin(x)tan(x)x =limx→0+−cos(x)sec2(x)1=−1 limx→0+xsin(x)=1e
I don't think this is correct, am I doing something wrong, and if so, where?
Answer
limx→0+xsin(x)
=limx→0+exp(ln(x)sin(x))
=exp(limx→0+ln(x)sin(x))
=exp(limx→0+ln(x)1/sin(x))
Applying L'Hôpital's rule:
=exp(limx→0+−sin(x)2xcos(x))
=exp(−1⋅limx→0+1cos(x)limx→0+sin(x)2x)
=exp(−limx→0+sin(x)2x)
Applying L'Hôpital's rule:
=exp(−limx→0+2cos(x)sin(x))
e0=1
=1
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