Solve Linear Trigonometric Equation 5cosx+1=3cosx (a) over interval [0,2pi) & (b) for all solutions

The trigonometric equation to be solved is 5cosx+1=3cosx. As this is a linear equation in cosx, all the cosx terms are collected on one side of the equation and all the constants on the other side. This results in cosx=-1/2. To find values in the interval [0, 2pi), the unit circle is used. All solutions include the coterminal angles for the solutions found on the unit circle so 2pi*n, where n is an element of the integers, is added to each of these solutions.

Timestamps
0:00 Introduction
0:45 Solve Linear Equation
3:00 Unit Circle
3:38 Part (a)
4:17 Part (b)