You can only ask one question at a time. I have edited the
question to comply with the same.
We have to find the value
of lim x--> 0 [ -x/tan(3x)]
If we substitute x = 0,
we get the indeterminate form 0/0. This allows the use of l'Hopital's rule. We
substitute the numerator and denominator by their
limits.
lim x--> 0 [
-x/tan(3x)]
=> lim x--> 0[ -1/3*(sec
3x)^2]
substitute x =
0
=>
-1/3
The required limit is
-1/3
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