Question 928577

{{{4+2sec(theta)=0}}}

{{{sec(theta)=-4/2}}}

{{{sec(theta)=-2}}}

{{{theta = 2/3 (3pi* n-pi)}}},  {{{ n}}} element {{{Z}}}

if {{{n=1}}} =>{{{theta=(4pi)/3}}} or {{{240}}}°  (degrees)