9 videos in "Unit Circle"
Trig functions special angles 2
Trig functions special angles 2
614 views - 00:09:21
Part of video series Trig Functions Special Angles
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
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.
- Trig Value Sheet - A "Cheat Sheet" with Trigonometry values and several Trig / Calculus formulas.
- Back of Trig Sheet - The back of the trig sheet with more Calculus formulas.
- 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?
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.
