TRIGONOMETRICAL RATIO || BASIC CONCEPTS || FORMULA DERIVATION

Описание: 📘 Trigonometric Ratios | Basic Formulas & Concepts | Class 10 | WBBSE • WBBME • ICSE • CBSE • Competitive Exams

In this video, we explain the fundamental concepts of Trigonometry starting from the basics—perfect for Class 10 students and for competitive exams.
You will learn:

✅ What are Trigonometric Ratios?
• Definition of sine, cosine, tangent
• Understanding cot, sec, cosec
• Ratios with respect to a right-angled triangle

✅ Standard Trigonometric Ratios
• sin θ = Perpendicular / Hypotenuse
• cos θ = Base / Hypotenuse
• tan θ = Perpendicular / Base
• cot θ = Base / Perpendicular
• sec θ = Hypotenuse / Base
• cosec θ = Hypotenuse / Perpendicular

✅ Important Values Table (0°, 30°, 45°, 60°, 90°)

Quick memorization tricks included!

✅ Basic Trigonometric Identities
• sin²θ + cos²θ = 1
• tan θ = sin θ / cos θ
• 1 + tan²θ = sec²θ
• 1 + cot²θ = cosec²θ

✅ Complementary Angle Relations
• sin (90° − θ) = cos θ
• tan (90° − θ) = cot θ
• sec (90° − θ) = cosec θ

🎯 Useful for:

✔ Class X (WBBSE, WBBME, CBSE, ICSE)
✔ NTSE / Olympiad / Entrance exams
✔ School exam preparation
✔ Quick revision before tests

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