5
9.5 The Sine and Cosine Ratios Sine and Cosine are very similar to that of Tangent, except for one important difference. While Tangent involves the lengths of both legs of a right triangle, Sine and Cosine are trigonometric ratios for acute angles that involve the lengths of a leg and the hypotenuse of a right triangle. Example 1: Finding Sine and Cosine Ratios Find sin $ , sin & , cos $ , cos &. Write each answer as a fraction and as a decimal rounded to four places. Do you see any patterns? Example 2: Rewriting Trigonometric Expressions Write sin 56 + in terms of cosine
