Fundamental Trigonometric Ratios
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 and all others are negative.
III QUADRANT: means and are positive and all others are negative.
IV QUADRANT: means and are positive and all others are negative.
I QUADRANT: means all trigonometric ratios are positive.
II QUADRANT: means and are positive and all others are negative.
III QUADRANT: means and are positive and all others are negative.
IV QUADRANT: means and are positive and all others are negative.
NOTE: (1) Clockwise we read
(2) Counterclockwise we read (All Silver Tea Cups)
(2) Counterclockwise we read (All Silver Tea Cups)
in Quadrant



































8) Trigonometric Ratios of Special Angles:










































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