Detailed description

  1. Illustration of coordinate axes. Quadrant one with sin theta positive, cos theta positive, quadrant two with sin theta positive, cos theta negative, quadrant three with sin theta negative, cos theta negative, quadrant four with sin theta negative, cos theta positive.
  2. Illustration of coordinate axes, quadrants 1 and 3 with tan theta positive, quadrants 2 and 4 with tan theta negative.