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Trigonometric functions

Lesson 3 Precalculus Online

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Lesson 3: Trigonometric Functions Topic 3: Reference Angles Examples : Find the reference angle for each angle. 1. Find the reference angle for 218?. Find the positive acute angle made by the terminal side of the angle and the x-axis: The reference angle for 218? is 218? - 180? = 38? 2. Find the reference angle for 1387 ? First find a coterminal angle between 0? and 360?. Divide 1387 by 360 to get a quotient of about 3.9. So subtract 360 three times. 1387? ? 3(360? ) = 307?. The reference angle for 307 ? is 360? ? 307? = 53? 360? ? 307? = 53? 3. Find the reference angle for -237? Find a coterminal positive angle by adding 360?: -237? + 360? = 123? The reference angle for 123? is 180? - 123? = 57?. 180 ? ? 123 ? = 57 ? 180? ? 123? = 57? Practice

Trig functions

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Review : Trig Functions The intent of this section is to remind you of some of the more important (from a Calculus standpoint?) topics from a trig class. One of the most important (but not the first) of these topics will be how to use the unit circle. We will actually leave the most important topic to the next section. First let?s start with the six trig functions and how they relate to each other. Recall as well that all the trig functions can be defined in terms of a right triangle. From this right triangle we get the following definitions of the six trig functions. Remembering both the relationship between all six of the trig functions and their right triangle definitions will be useful in this course on occasion.

Trig Functions Chapter 1.2

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Copyright ? 2009 Pearson Addison-Wesley 1.2-* 1 Trigonometric Functions Copyright ? 2009 Pearson Addison-Wesley Copyright ? 2009 Pearson Addison-Wesley 1.2-* 1.1 Angles 1.2 Angle Relationships and Similar Triangles 1.3 Trigonometric Functions 1.4 Using the Definitions of the Trigonometric Functions 1 Trigonometric Functions Copyright ? 2009 Pearson Addison-Wesley Copyright ? 2009 Pearson Addison-Wesley 1.1-* 1.2-* Angle Relationships and Similar Triangles 1.2 Geometric Properties ? Triangles Copyright ? 2009 Pearson Addison-Wesley 1.1-* Copyright ? 2009 Pearson Addison-Wesley 1.1-* 1.2-* Vertical Angles The pair of angles NMP and RMQ are vertical angles. Vertical angles have equal measures. Copyright ? 2009 Pearson Addison-Wesley 1.1-*

Easy way to remember the positives and negatives of the trigonometric functions on a graph

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All you have to remember is " All Students Take Calculus" Stating from the first quad, its A for I, S for II, T for III, and C for IV. the acronyms stand for which of the functions are positive. A stands for all, all the functions are positive S stands for Sin, Only sin and csc are positive, rest are negative T stands for Tan, Only tan and cot are positive, rest are negative C stands for Cos, Only cos and sec are positive, rest are negative

Trigonometry Reference Chart

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The unit circle is a commonly used tool in trigonometry because it helps the user to remember the special angles and their trigonometric functions. The unit circle is a circle drawn with its center at the origin of a graph(0,0), and with a radius of 1. All angles are measured starting from the x-axis in quadrant one and may go around the unit circle any number of degrees. Points on the outside of the circle that are in line with the terminal (ending) sides of the angles are very useful to know, as they give the trigonometric function of the angle through their coordinants. The format is (cos, sin). Note that in trigonometry, an angle can be of any size, positive or negative. An angle larger than 360º means that you have gone round the circle more than once.

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