# Question #a4db9

##### 2 Answers

See below

#### Explanation:

This is the first thing that occurs to me so a better answer may come along but I would operate on the basis that

from the formal definition

The red and blue terms are well known limits provable using squeeze theorem.

So

Now to prove that

if we start with:

But by the chain rule applied to

So by

That completes this approach, I think.

Refer to the **Explanation Section** below.

#### Explanation:

Let

Now,

To evaluate this Limit, let,

where,

Hence, in this new scenario,

Here, we see that, the

Therefore,

Now,

But,

Therefore,

**Enjoy Maths!**