By David A Kay

*CliffsQuickReview Trigonometry* provide you with all you must comprehend to appreciate the elemental ideas of trigonometry — even if you wish a complement for your textbook and sessions or an at-a-glance reference. Trigonometry is not only measuring angles; it has many purposes within the genuine international, reminiscent of in navigation, surveying, development, and lots of different branches of technology, together with arithmetic and physics. As you're employed your approach via this evaluation, you will be able to take on such strategies as

- Trigonometric features, comparable to sines and cosines
- Graphs and trigonometric identities
- Vectors, polar coordinates, and intricate numbers
- Inverse services and equations

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**Example text**

You can define trig functions by using a unit circle, a circle with a radius of 1. As a point revolves around the circle, its distance from the x-axis is defined as the sine, and its distance from the y-axis is defined as the cosine. These definitions match the previous definitions in terms of a right triangle. The graphs of trigonometric functions are used to visually represent their behavior. Radians A central angle of a circle has an angle measure of 1° if it subtends an arc that is 1⁄360 of the circumference of the circle.

88 sq units Law of Cosines The previous section covered the solving of right triangles. In this section, and the next, you see formulas that can solve any triangle. If α, β, and γ are the angles of any (right, acute, or obtuse) triangle, and a, b, and c are the lengths of the three sides opposite α,β, and γ, respectively, then a 2 = b 2 + c 2 - 2bc cos a b 2 = a 2 + c 2 - 2ac cos b c 2 = a 2 + b 2 - 2ab cos c These three formulas are called the Law of Cosines. Each follows from the distance formula and is illustrated in Figure 2-7.

True 7. 99 square feet 8. F 7/27/01 8:50 AM Page 51 Chapter 3 GRAPHS OF TRIGONOMETRIC FUNCTIONS Chapter Checkin ❑ Defining angles in terms of the radius of a circle ❑ Understanding the relationship between radian and degree measure ❑ Defining trig functions in terms of a unit circle ❑ Figuring out the period and symmetry of trig functions ❑ Creating the graphs of trig functions ou can measure angle sizes by using more than one scale. The degree scale is probably the most well-known scale, although the radian scale Y is equally as popular and useful.