Question 1170386

using calculator

{{{(3tan^2(30)-1)(3tan^2(30)-3)=0}}}....... true

{{{(3tan^2(120)-1)(3tan^2(120)-3)=0}}} .........{{{false}}}

{{{(3tan^2(150)-1)(3tan^2(150)-3)=0}}}....... true

{{{(3tan^2(225)-1)(3tan^2(225)-3)=0}}}....... true

{{{(3tan^2(315)-1)(3tan^2(315)-3)=0}}}....... true

=> answer is:  b. {{{120}}} degrees