Shadow236 Mar 2013 49 0 USA Sep 8, 2013 #1 How would I find a Cartesian equation for r = 4secx? Thanks.

S Soroban MHF Hall of Honor May 2006 12,028 6,341 Lexington, MA (USA) Sep 8, 2013 #2 Hello, Shadow236! \(\displaystyle \text{How would I find a Cartesian equation for: }\: r \,=\, 4\sec\theta\,?\) Click to expand... I will assume you know the conversion identities. We have: .\(\displaystyle r \:=\:\frac{4}{\cos\theta} \quad\Rightarrow\quad r\cos\theta \:=\:4 \quad\Rightarrow\quad x \,=\,4\) Reactions: 1 person

Hello, Shadow236! \(\displaystyle \text{How would I find a Cartesian equation for: }\: r \,=\, 4\sec\theta\,?\) Click to expand... I will assume you know the conversion identities. We have: .\(\displaystyle r \:=\:\frac{4}{\cos\theta} \quad\Rightarrow\quad r\cos\theta \:=\:4 \quad\Rightarrow\quad x \,=\,4\)