Derivation Of Cos2X Formula

Title: Derivation Of Cos(2x) Formula | Trigonometry Explained

In this video, we dive into the derivation of the double angle identity for cosine, specifically the cos(2x) formula. We'll break down the process step by step, starting with the fundamental trigonometric identities and leading up to the final equation. By the end, you'll understand how the formula for cos(2x) can be expressed in different forms, such as:

cos(2x) = cos²(x) - sin²(x)

cos(2x) = 2cos²(x) - 1

cos(2x) = 1 - 2sin²(x)

Whether you're a student preparing for exams or just looking to strengthen your understanding of trigonometry, this video will help you grasp the concepts and derivation behind this important formula.

📚 Topics Covered:

Double Angle Identities

Trigonometric Identities Recap

Step-by-Step Derivation of cos(2x)

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