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Trigonometry

Khan Academy, , Prof. Salman Khan

Updated On 02 Feb, 19

Overview

Contents:
Basic Trigonometry - Basic Trigonometry - Radians and degrees - Using Trig Functions - The unit circle definition of trigonometric function - Unit Circle Definition of Trig Functions - Graph of the sine function - Graphs of trig functions - Graphing trig functions - More trig graphs - Determining the equation of a trigonometric function - Trigonometric Identities - Proof: sin(a+b) = (cos a)(sin b) + (sin a)(cos b) - Trigonometry word problems - Law of cosines - Navigation Word Problem - Proof: Law of Sines - Ferris Wheel Trig Problem - Fun Trig Problem - Polar Coordinates - Inverse Trig Functions: Arcsin - Inverse Trig Functions: Arctan - Inverse Trig Functions: Arccos - Trigonometry Identity Review/Fun

Lecture 20: Law of cosines

4.1 ( 11 )

Lecture Details

Introduction to the law of cosines to solve for a side of a triangle when 2 sides and an angle are known.

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