Using Complex Numbers to solve Trig Problems! - Mastering AMC 10/12

The book includes video lectures for every topic on the AMC 10/12 contests, along with many useful formulas and hundreds of examples and practice problems with detailed video solutions.

The book covers the most important concepts on the AMC 8 contest, and includes video lectures for every chapter, formulas for every topic, and hundreds of examples and practice problems with detailed video solutions.

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In this video, we discussed Using Complex Numbers to solve Trigonometry
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For more practice, watch the following free courses:

1. AMC 8 Fundamentals Course:

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3. Mastering AMC 8 Course:

4. AMC 10/12 Fundamentals Course:

5. Mastering AMC 10/12 Course:

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Tags:
AMC 8, AMC 8 Preparation, AMC 8 Crash Course, AMC 8 Concepts, AMC 8 Review, AMC 10, AMC 12, MATHCOUNTS, MathLeague, Number Theory, Primes, Factors, Competition math, Number of Factors, Sum of Factors, Product of Factors, Permutations, Combinations, Combinatorics, Modular Arithmetic, Recursion, Probability, Divisibility, Competition Math, Area of a Triangle, Similar Triangles, Cyclic Quadrilateral, Power of a Point, 3D Geo, Polygons, Coordinate Geometry

[minecraftpro]

could you explain to me a little more in detail about the roots of unity stuff and why w + w^2 + w^3 ... = -1 ? Is this true all the time?