Trigonometric Functions and Their Properties
This page delves into the main trigonometric functions and their characteristics.
The primary trigonometric functions are introduced:
• Sine (sin) • Cosine (cos) • Tangent (tan) • Cotangent (cot)
Definition: • sin θ = opposite side / hypotenuse • cos θ = adjacent side / hypotenuse • tan θ = opposite side / adjacent side = sin θ / cos θ • cot θ = adjacent side / opposite side = cos θ / sin θ
Key properties of these functions are discussed:
• Domain and range of each function • Periodicity • Relationship between functions (e.g., tan θ = sin θ / cos θ)
Highlight: The fundamental trigonometric identity: sin²θ + cos²θ = 1
The section also covers the behavior of these functions in different quadrants of the coordinate plane, emphasizing sign changes and special angle values.
Example: At 45°, sin θ = cos θ = 1/√2, and tan θ = 1