Maybe im doing this wrong, but this doesn't seem to exist, or the answer is undefined.

Find an equation for the line tangent to the curve at the point defined by the given value of t. Also, find the value of at this point.

Well, I did

and

or

so, I plugged back in the to get

So I checked in my calculator, and the oval does not even go through the point , so it cant exist? Did I do something wrong?