question_answer

If \[k\,\sec \theta +I\tan \theta +m=0\] and \[x\,\sec \theta +y\,\tan \theta +z=0\] then \[{{(Iz-ym)}^{2}}-{{(xm-kz)}^{2}}=\]_____

A) \[{{\left( ky\text{ }-\text{ }Ix \right)}^{2}}\]   

B)  \[{{\left( kx\text{ }-\text{ }Iy \right)}^{2}}\]

C)  \[{{\left( Ix\text{ }+ky \right)}^{2}}\]                                                   

D) \[{{\left( kz\text{ }-\text{ }Ix \right)}^{2}}\]

E) None of these