Which of the following statements are true for any triangle? choose all that apply. (3 correct answers)
. tan x = sin x / cos x
. tan x = cos x / sin x
. sin x = cos x . tan x
. cos x = sin x . tan x
. cos x = sin x / tan x

Tan(x) = sin(x)/cos(x) is one trig identity you should memorize. So one of the answers is choice A. 



Multiply both sides by cos(x) to get

cos(x)tan(x) = sin(x)
sin(x) = cos(x)tan(x)

Another answer is choice C



Then we can divide both sides by tan(x) to get

sin(x)/tan(x) = cos(x)
cos(x) = sin(x)/tan(x)

Choice E is another answer.



In summary the answers are: A, C, E

Step 1: 6x-10=1; step 2: 6x=11