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🧩 Trigonometry Basics: Cos 45°

Everyone knows sin 30° and cos 60°, but do you know how to derive the exact value of cos 45° without memorizing? In this video, I’ll explain the step-by-step method to calculate cos 45° using simple geometry.

What you’ll learn in this video:
✔️ Exact value of cos 45°
✔️ Easy geometric proof of cos 45°
✔️ How to remember special angle values in trigonometry
✔️ Useful tricks for Olympiad & competitive exams

📘 Perfect for:

Math Olympiad Preparation

Trigonometry Basics & Review

Competitive Exams (JEE, SAT, SSC, etc.)

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