Thursday

January 19, 2017
Posted by **Adrianna** on Tuesday, March 20, 2012 at 12:40pm.

r² = 16/cos2è

r = -4

r² = 8

help please im stuck between 2 answers.

- Converting Cartesian Equations to Polar Equations -
**Steve**, Tuesday, March 20, 2012 at 12:46pmx = rcosθ

y = rsinθ

x^2 - y^2 = r^2 cos^2 θ - r^2 sin^2 θ

= r^2(cos^2 θ - sin^2 θ) = r^2 cos2θ

so, we have r^2 cos2θ = 16

r^2 = 16/cos2θ - Converting Cartesian Equations to Polar Equations -
**Adrianna**, Tuesday, March 20, 2012 at 12:53pmThank you.