Wednesday 15 January 2014

`lim_(x->oo)sinx/(x-pi)` Evaluate the limit, using L’Hôpital’s Rule if necessary.

Given to solve,


`lim_(x->oo) sinx/(x-pi)`


This can be solved by applying the squeeze theorem and is as follows


as we know the limits or boundaries of `sin(x)` is


`-1<=sin(x)<=1`


Dividing the above expression with x-pi we get


`-1/(x-pi)<=sin(x)/(x-pi)<=1/(x-pi)`


now, let us apply the limits that` x-> oo` we get


`lim_(x->oo)(-1/(x-pi))<=lim_(x->oo) sin(x)/(x-pi)<=lim_(x->oo) 1/(x-pi)`


but


`lim_(x->oo)(-1/(x-pi)) = -1/(oo -pi) = 0`


`lim_(x->oo)(1/(x-pi))= 1/(oo -pi) = 0`


so,


`0<=lim_(x->oo) sin(x)/(x-pi)<=0`


so ,


`lim_(x->oo) sin(x)/(x-pi) = 0`

Given to solve,


`lim_(x->oo) sinx/(x-pi)`


This can be solved by applying the squeeze theorem and is as follows


as we know the limits or boundaries of `sin(x)` is


`-1<=sin(x)<=1`


Dividing the above expression with x-pi we get


`-1/(x-pi)<=sin(x)/(x-pi)<=1/(x-pi)`


now, let us apply the limits that` x-> oo` we get


`lim_(x->oo)(-1/(x-pi))<=lim_(x->oo) sin(x)/(x-pi)<=lim_(x->oo) 1/(x-pi)`


but


`lim_(x->oo)(-1/(x-pi)) = -1/(oo -pi) = 0`


`lim_(x->oo)(1/(x-pi))= 1/(oo -pi) = 0`


so,


`0<=lim_(x->oo) sin(x)/(x-pi)<=0`


so ,


`lim_(x->oo) sin(x)/(x-pi) = 0`

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