Question

help! WILL GIVE MEDALS!!
i have no idea how to start this...
find sin2x, cos2x, and tan2x given cscx=5, tanx<0

Answer 1

tan x is positive in Q III

Answer 2

imm sorry, i put the wrong problem up

Answer 3

its supposed to be CSCx=5, tanx<0

Answer 4

ok then that angle is in the second quadrant
csc x = 1/ sin x
sin x = 1/5

Answer 5

ok, so then do i just do the formulas again, use cos2x and find sin2x?

Answer 6

cos2a= \[1-2\sin ^{2}x\]

Answer 7

ohh wait so do the opposite over hypotenuse thing?

Answer 8

you can find cos x , tan x from the above digram

Answer 9

yes