Question

What is the Cartesian form of `(-2,(81pi) /16)`?

Answer 1

`~~(1.96, 0.39)`

Explanation:

Given: `(-2, (81 pi)/16) = (r, theta)`

To convert to Cartesian form `(r cos theta, r sin theta)`

When using your calculator, make sure MODE = radians

`-2 cos (81 pi)/16 ~~ 1.961570561`

`-2 sin (8a pi)/16 ~~ .390180644`

`~~(1.96, 0.39)`