1)
2)         
3)
4)
5)
6)
7) Signs of trigonometric Ratios
    I QUADRANT: , means all trigonometric ratios are positive.
   II QUADRANT: , means  and  are positive all others are negative.
  III QUADRANT: , means  and  are positive all others are negative.
  IV QUADRANT: , means  and  are positive all others are negative.

NOTE: (1) Clockwise; we read
             (2) Anticlockwise; we read  (All Silver Tea Cups)

8) Trigonometric Ratios of Special Angles:

RULE: Write  divide by  then taking square roots and write the resulting number in column of .