Prove that..cosecs/4+Cota/2=Cota/8-coseca /2

Which one ? is the answer and how to find this answer

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

Is the point (0, 8) on the x-axis or y-axis? how do you know?