Question 914948
 x in Quadrant II
tan x = -12/5, then sin x = 12/13 and cos x = -5/13
Plug and Play
sin 2x = 2sin x cos x = {{{2(12/13)(-5/13)}}}
cos 2x = {{{cos^2(x) - sin^2(x)}}} 
tan 2x = {{{(2tan(x))/(1-tan^2(x))}}}