Trigonometry: Sine, Cosine, Tangent

🎬 Video Tutorial

  • Basic Trigonometry: Sine, cosine, and tangent depend only on angle θ in the right-angled triangle; they do not change with the size of the triangle.
  • Trigonometric Ratios: sin θ = opposite/hypotenuse, cos θ = adjacent/hypotenuse, tan θ = opposite/adjacent.
  • Solving for Sides: Use trigonometric ratios with a known angle and side to find missing triangle sides.
  • Finding Angles: Find unknown angles θ using inverse functions like cos⁻¹ on a calculator.
  • Key Angle Values: Memorise trigonometric values for common angles (30°, 45°, 60°) to simplify calculations.

📂 Revision Cards

💬 ChatCat (AI Math Tutor)