# Calculus 2 : New Concepts

## Example Questions

### Example Question #11 : New Concepts

Use Euler's method to find the solution to the differential equation   at  with the initial condition  and step size .

Explanation:

Euler's method uses iterative equations to find a numerical solution to a differential equation.  The following equations

are solved starting at the initial condition and ending at the desired value.   is the solution to the differential equation.

In this problem,

Starting at the initial point

We continue using Euler's method until .  The results of Euler's method are in the table below.

### Example Question #12 : New Concepts

Use Euler's method to find the solution to the differential equation   at  with the initial condition  and step size .

Explanation:

Euler's method uses iterative equations to find a numerical solution to a differential equation.  The following equations

are solved starting at the initial condition and ending at the desired value.   is the solution to the differential equation.

In this problem,

Starting at the initial point

We continue using Euler's method until .  The results of Euler's method are in the table below.

### Example Question #13 : New Concepts

Use Euler's method to find the solution to the differential equation   at  with the initial condition  and step size .

Explanation:

Euler's method uses iterative equations to find a numerical solution to a differential equation.  The following equations

are solved starting at the initial condition and ending at the desired value.   is the solution to the differential equation.

In this problem,

Starting at the initial point

We continue using Euler's method until .  The results of Euler's method are in the table below.

Note: Using a step size of  gives an answer that is not close to the correct answer,  .  This is because the step size is too small.

### Example Question #14 : New Concepts

Use Euler's method to find the solution to the differential equation   at  with the initial condition  and step size .

Explanation:

Euler's method uses iterative equations to find a numerical solution to a differential equation.  The following equations

are solved starting at the initial condition and ending at the desired value.   is the solution to the differential equation.

In this problem,

Starting at the initial point

We continue using Euler's method until .  The results of Euler's method are in the table below.

Note: Using a larger step size got us closer the correct answer,  .

### Example Question #15 : New Concepts

Euler's explicit method is often used to find a numerical solution to a differential equation.Given the step size and initial condition, it utilizes the tangent line equation to find the consecutive value of the solution function.

Find an approximation to a given differential equation using Euler's explicit method:

Use step size , and range of  from 0 to 3.

Initial condition is .

In the answer there should be three consecutive values of solution function for given range and step size of x.

Explanation:

Recall formula of the tangent line to a two-dimensional function from Calculus 1:

For the Euler's method, this equation can be rewritten as:

Where  is the next value of the solution function,  is the derivative of the previous step.

We are given a differential equation . Therefore, if we know the value of  and , we can find the . Consecutively, we can plug it into the Euler's method equation and find the .

Here is how this process is executed for the y(1):

1) Identify the initial condition and step size. This is the only information that Euler's method uses to calculate the approximation of solution function, other than the equation itself. In this case, we can say, that for the first step,

Note, that for the whole process, step size remains the same,

2) Calculate the derivative of function at point  using given differential equation. In this case,

3) Note that in step 2 we found . Now we have all components to plug in to the Euler's method formula. Again, for our first step:

The same algorithm is used for y(2) and y(3). Note, that if we know step size and range of x, we will always know . For each consecutive step,  is the value of the solution function, found in the previous step.

### Example Question #1 : Euler's Method And L'hopital's Rule

Evaluate:

The limit does not exist.

Explanation:

Let's examine the limit

first.

and

,

so by L'Hospital's Rule,

Since ,

Now, for each ; therefore,

By the Squeeze Theorem,

and

### Example Question #197 : Derivatives

Evaluate:

The limit does not exist.

Explanation:

Therefore, by L'Hospital's Rule, we can find  by taking the derivatives of the expressions in both the numerator and the denominator:

Similarly,

So

But  for any , so

### Example Question #1 : Limits

Evaluate:

The limit does not exist.

Explanation:

and

Therefore, by L'Hospital's Rule, we can find  by taking the derivatives of the expressions in both the numerator and the denominator:

Similarly,

so

### Example Question #1 : Euler's Method And L'hopital's Rule

Evaluate:

Explanation:

and

Therefore, by L'Hospital's Rule, we can find  by taking the derivatives of the expressions in both the numerator and the denominator:

### Example Question #1 : L'hospital's Rule

Solve:

Explanation:

Substitution is invalid.  In order to solve , rewrite this as an equation.

Take the natural log of both sides to bring down the exponent.

Since  is in indeterminate form, , use the L'Hopital Rule.

L'Hopital Rule is as follows:

This indicates that the right hand side of the equation is zero.

Use the term  to eliminate the natural log.