Trig functions special angles 2

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Taught by YourMathGal
  • Currently 4.0/5 Stars.
4701 views | 1 rating
Part of video series
Meets NCTM Standards:
Lesson Summary:

In this lesson, the teacher shows an easy way to find the trig functions of special angles and angles at multiples of 90 degrees. By using a right triangle and labeling the sides, the teacher demonstrates how to find the sine, cosine, tangent, cotangent, csc, and sec of each angle. Through seven examples, the teacher explains how to use this method, emphasizing that it is just one way of doing it and can be a helpful tool in finding exact trig function values.

Lesson Description:

Easy way to use right triangle and label sides to find sin, cos, tan, cot, csc, and sec of the special angles, and of angles at multiples of 90 degrees. Part 2.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

Questions answered by this video:
  • What are the special angles in trigonometry?
  • What is an easy way to find trig functions of special angles?
  • How can you use special triangles from geometry to easily find trig values on the unit circle?
  • What do sec, csc, and cot mean and how do you find their values?
  • How do you find cos 300 degrees?
  • How do you find cot 180 degrees?
  • How do you find sin 1305 degrees?
  • How do you find sec -210 degrees?
  • How do you find csc 750 degrees?
  • How do you find cos 270 degrees?
  • How do you find sin -420 degrees?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson continues from where the previous lesson left off but includes the trig functions secant (sec), cosecant (csc), and cotangent (cot). The 30, 60, 90 and 45, 45, 90 special triangles are used to easily find the values of trig functions at common angle measures. The answer to the final problem should be -(square root 3)/2, NOT -1/2.