For the trigonometric ratio sin, you would divide the side opposite of the angle by the hypotenuse. In this case, sinX=12/13, or 0.92.
For tan we would divide the opposite side by the adjacent side. This gets us that tanX=12/5, or 2.4.
Finally for cos, we would divide the adjacent side by the hypotenuse. In the problem, this is cosX=5/13, or 0.38.
:)
