# Trig functions special angles 1

Taught by YourMathGal
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Part of video series
Meets NCTM Standards:
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 1.

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

• What are the special angles in trigonometry?
• What is an easy way to find trig functions of special angles?
• How do you find cos 90 degrees?
• How do you find tan 90 degrees?
• How do you find sin 630 degrees?
• How do you find sin 135 degrees?
• How do you find tan -405 degrees?
• How do you find sin 210 degrees?
• How do you find tan -30 degrees?
• What does r stand for in unit circle trigonometry?
• How can you use special triangles from geometry to easily find trig values on the unit circle?
• #### Staff Review

• Currently 4.0/5 Stars.
This lesson shows the special angles in trigonometry and explains an easy method for finding the trig functions of these special angles. This is a very useful lesson and helps you be able to easily find the sin, cos, and tan of common angles.