Question

Question #f36f5

Answer 1

`r=sqrt(2/(cos(theta)sin(theta)))`

Explanation:

We know that:
`x=r cos(theta)`
`y=r sin(theta)`

Substituting:
`2xy=4`
`2(rcos(theta))(rsin(theta))=4`
`r^2=2/(cos(theta)sin(theta))`
`r=sqrt(2/(cos(theta)sin(theta)))`