Video Instruction     The 6 Trigonometric ratios Section 7.1 An introduction to the first three trigonometric ratios (sin, cos, tan) (8:14) Section 7.2 Three more trigonometric ratios (csc, sec, cot) (5:07) Section 7.3 Evaluating the Trig ratios using the unit circle (6:53) Section 7.4 Evaluating the Trig ratios at 0,90,180,270,360 (6:25) Section 7.5 Evaluating the Trig ratios at increments of 45 degrees (9:35) Section 7.6 Evaluating the Trig ratios at increments of 30 degrees (10:45) Section 7.7 Evaluating the Trig ratios at increments of 60 degrees (4:16)