precalculus
posted by Adam
tanx= 12/5 x in quadrant 2
find;
sin2x=
cos2x=
tan2x=

Damon
draw a sketch of x y axis system
x = 5
y = 12
hypotenuse = 13
sin x = 12/13
cos x = 5/13
tan x = 12/5
now use 2x formulas
for example
sin 2x = 2 sin x cos x = 24/13 * 5/13
= 120/169
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