Respuesta :

[tex]r=4\sec \theta[/tex]

use the definition of sec and write it in terms of cos

[tex]r=4\cdot\frac{1}{\cos \theta}[/tex]

multiply both sides by cos

[tex]r\cos \theta=4[/tex]

then we know that r*cos is equal to x in the cartesian

[tex]x=4[/tex]