How Do You Find the Normal to the Parametric Equation r(t) = <acos t, bsin t>?

[david90]

r(t) = <acos t , bsin t>

 

[HallsofIvy]

Now, how about you go back, read the question again and the give it exactly.

In the first place an equation doesn't have a normal, a curve does.

If you mean, "find the equation for the normal to the curve given by r(t) = <acos t , bsin t> for any t", then say so.

Heres' a major hint the vector <a, b> is always normal to the vector <-b, a>.

 

[ShawnD]

In order to have a normal, you need to give us 1 set of coordinates.