# Why do we use integration?

## Why do we use integration?

Just as definite integrals can be used to find the area under a curve, they can also be used to find the area between two curves. To find the area between two curves defined by functions, integrate the difference of the functions. In this section, we use definite integrals to find volumes of three-dimensional solids.

## What’s harder derivatives and integrals?

Integration is generally much harder than differentiation. This little demo allows you to enter a function and then ask for the derivative or integral. You can also generate random functions of varying complexity. Differentiation is typically quite easy, taking a fraction of a second.

**Are integrals easy?**

If you look at it from a different perspective, integration is the easy operation, and differentiation is the hard one. Integration is a continuous operator on functions. If two functions are close together, then their integrals will be as well.

### Can an integral have 2 answers?

On the other hand, there are no cases in which an integral actually has two different solutions; they can only “look” different. For example, x+c and x2+c cannot both be solutions to the same integral, because x and x2 don’t differ by a constant.

### Who invented limits?

Englishman Sir Issac Newton and German Gottfried Wilhelm von Leibniz independently developed the general principles of calculus (of which the theory of limits is an important part) in the seventeenth century.

**Can 0 be a limit?**

When simply evaluating an equation 0/0 is undefined. However, in take the limit, if we get 0/0 we can get a variety of answers and the only way to know which on is correct is to actually compute the limit. Once again however note that we get the indeterminate form 0/0 if we try to just evaluate the limit.

## Does a limit exist?

In order for a limit to exist, the function has to approach a particular value. In the case shown above, the arrows on the function indicate that the the function becomes infinitely large. Since the function doesn’t approach a particular value, the limit does not exist.

## Can a limit exist at a hole?

If there is a hole in the graph at the value that x is approaching, with no other point for a different value of the function, then the limit does still exist.

**Where do limits not exist?**

If the graph is approaching the same value from opposite directions, there is a limit. If the limit the graph is approaching is infinity, the limit is unbounded. A limit does not exist if the graph is approaching a different value from opposite directions.

### Does a hole mean DNE?

HoleA hole exists on the graph of a rational function at any input value that causes both the numerator and denominator of the function to be equal to zero. limitA limit is the value that the output of a function approaches as the input of the function approaches a given value.

### How do you prove a limit does not exist?

To prove a limit does not exist, you need to prove the opposite proposition, i.e. We write limx→2f(x)=a if for any ϵ>0, there exists δ, possibly depending on ϵ, such that |f(x)−a|<ϵ for all x such that |x−2|<δ.