# Course - Trigonometry

Course Level: High School

Videos on trigonometry. Watch the "Geometry" playlist first if you have trouble understanding the topics covered here.

Prerequisites
• Lecture 1 - Basic Trigonometry
• Lecture 2 - Basic Trigonometry II
• Lecture 3 - Radians and degrees
• Lecture 4 - Using Trig Functions
• Lecture 5 - Using Trig Functions Part II
• Lecture 6 - The unit circle definition of trigonometric function
• Lecture 7 - Unit Circle Definition of Trig Functions
• Lecture 8 - Graph of the sine function
• Lecture 9 - Graphs of trig functions
• Lecture 10 - Graphing trig functions
• Lecture 11 - More trig graphs
• Lecture 12 - Determining the equation of a trigonometric function
• Lecture 13 - Trigonometric Identities
• Lecture 14 - Proof; sin(a+b)= (cos a)(sin b) + (sin a)(cos b)
• Lecture 15 - Proof; cos(a+b)= (cos a)(cos b)-(sin a)(sin b)
• Lecture 16 - Trigonometric identities part 2
• Lecture 17 - Trigonometric identies part 3
• Lecture 18 - Trigonometry word problems (part 1)
• Lecture 19 - Trigonometry word problems (part 2)
• Lecture 20 - Law of cosines
• Lecture 21 - Navigation Word Problem
• Lecture 22 - Proof; Law of Sines
• Lecture 23 - Ferris Wheel Trig Problem
• Lecture 24 - Ferris Wheel Trig Problem (part 2)
• Lecture 25 - Fun Trig Problem
• Lecture 26 - Polar Coordinates 1
• Lecture 27 - Polar Coordinates 2
• Lecture 28 - Polar Coordinates 3
• Lecture 29 - Inverse Trig Functions; Arcsin
• Lecture 30 - Inverse Trig Functions; Arctan
• Lecture 31 - Inverse Trig Functions; Arccos
• Lecture 32 - Trigonometry Identity Review Fun