Given,
Substituting to get,
As, this limit is undefined so the other approach would be,
Suppose , then
Thus,
Using the trigonometric ratio, to get,
Multiply and divide by to get,
Therefore, .
Given,
Substituting to get,
As, this limit is undefined so the other approach would be,
Suppose , then
Thus,
Using the trigonometric ratio, to get,
Multiply and divide by to get,
Therefore, .