Trigonometry and Alphabetical order

Perhaps the following connections between various mathematical concepts will be helpful. When in doubt, just remember the alphabetical order.

X-coordinate Y-coordinate
Abscissa Ordinate
Domain Range

Cosine Sine
X-coordinate (of unit circle) Y-coordinate (of unit circle)
Adjacent / Hypotenuse (in right triangle) Opposite / Hypotenuse (in right triangle)