The Trigonometric Ratios

0:00 The six trigonometric functions (SOH CAH TOA) 1:25 Example: the six functions of θ 2:25 Reciprocal and quotient identities 3:23 Graphs of the trigonometric functions 3:35 Graphs of y = sin θ and y = cos θ 4:12 Cofunctions 5:09 Cofunction theorem and cofunction identities 5:45 Example: each function value in terms of its cofunction