- #1

0kelvin

- 50

- 5

For ex: $$x^2 + y^2 = 4$$ and $$z = xy$$

In the solutions manual the answer is given like this: a sum of terms of cos t and sin t (is this polar form?). The way I did wasn't using cos t. I isolated y, substituted in z = xy and assumed x = t. Which resulted in something like this r(t) = (... , ... , ...). This form should be the same thing as r(t) = ai + bj + ck.

Do I have to use polar coordinates in this exercise? I believe that I went cartesian coordinates in my solution. (not forgetting that ## y = \pm \sqrt{4 - x^2}##)