Step 2: Label the sides of the triangle according to the ratios of that special triangle. 30 ∘ 60 ∘ x 3 x 2 x. Step 3: Use the definition of the trigonometric ratios to find the value of the indicated expression. sin ( 30 ∘) = opposite hypotenuse = x 2 x = 1 x 2 x = 1 2. Note that you can think of x as 1 x so that it is clear that x 2 x About this unit. In this unit, you'll explore the power and beauty of trigonometric equations and identities, which allow you to express and relate different aspects of triangles, circles, and waves. You'll learn how to use trigonometric functions, their inverses, and various identities to solve and check equations and inequalities, and to So the cosine of 0° = 1, cosine of 30° = 0.9, etc. If you need the cosine, you can just jot down the values of sine and then put them in the reverse order, no memorization necessary. Finally, if you need the tangent, divide sine by cosine. If you have any trouble remembering what to divide by what, sine is already above cosine in the table In geometric terms, the sine of an angle returns the ratio of a right triangle's opposite side over its hypotenuse. For example, the sine of PI()/6 radians (30°) returns the ratio 0.5. =SIN(PI()/6) // Returns 0.5 Using Degrees. To supply an angle to SIN in degrees, multiply the angle by PI()/180 or use the RADIANS function to convert to radians. .

cos tan sin values