Fundamental Trigonometric Ratios
1)
2)
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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)
in Quadrant 


































8) Trigonometric Ratios of Special Angles:










































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