Calculus isn't easy. It took the genius of Isaac Newton to develop, so don't be discouraged.

Do you understand why you have to apply the power rule to

?

Remember that you defined x and y as functions of t when you wrote:

and

This means that

is a function of a function. The same is true with

. In order to differentiate I have to apply the chain rule.

Then the derivative is:

You don't want leave it in this form since

, you should substitute this for the

**Can you tell what the derivative with respect to t of is?**