Trig/precal help. have to leave soon, need help asap

Question

Trig/precal help. have to leave soon, need help asap <3

taism8 · Answer

Find sin 2x, cos 2x, and tan 2x from the given information.
sin x = $$\frac{ 8 }{ 17 }$$ and x in Quadrant I
sin 2x	=	
cos 2x	=	
tan 2x	=

taism8 · Answer

|dw:1471993400122:dw|

taism8 · Answer

sinx = $$\frac{ 8 }{ 17 }$$
cos x = $$\frac{ 15 }{17 }$$
tan x = $$\frac{ 8 }{15 }$$

taism8 · Answer

this is how much I know, I dont know how to do the sin2x cos2x and tan2x lol

taism8 · Answer

@zepdrix

taism8 · Answer

@Nnesha

zepdrix · Answer

|dw:1471993850577:dw|You figured out that the missing side length is 15 or something? Ok great.
That's pretty much all we need.

taism8 · Answer

ok

zepdrix · Answer

From here, apply your Double angle formulas.$$\large\rm \sin2x=2\sin x \cos x$$And then plug those ratios in separately.

taism8 · Answer

so it would be 2 * 8/17 * 15/17

zepdrix · Answer

Mmmm yes good.

taism8 · Answer

okie dokie

zepdrix · Answer

Remember your other double angle identities? :)

taism8 · Answer

are you sure tho? that doesnt seem right :/

taism8 · Answer

yea google is my friend lol

taism8 · Answer

simplifies to 612/289 which im not sure if my teacher would make such an absurd answer