Question

Question #5b44c

Answer 1

`x = 0 and y<=0`

Explanation:

`theta = -9/2pi` separates Q3 and Q4. Sine is negative in Q3 and

Q4. and so,

`sin (-9/2pi)=-1, and cos (-9/2pi)=0`

Conversion formula is

`(x, y) = r(cos theta, sin theta) = r(cos(-9/2pi), sin (-9/2pi) = r(0, -1)`.

So, `x = 0 and y = -r <= 0`.