Six trigonometric functions when an angles coordinates are (12,5)

X = 12 y = 5 ... to get r you'll add 12^2 + 5^2 = r^2. From there you just place the numbers in trig functions ... sin = y/r cos=x/r tan=y/x csc=r/y and so on. If you draw the triangle it's much easier than it looks here.