April 14, 2024

Table of contents & cheatsheet (TRIGONOMETRY AND CIRCULAR FUNCTIONS)

3.2. Basic trigonometry

Basic trigonometry

Before each question make sure calculator is in correct setting: degrees or radians?

Basic trigonometry 1

Right-angle triangle (triangle with 90° angle)

Right-angle triangle (triangle with 90° angle)

Non-right angle triangles

Non-right angle triangles

Use this rule when you know: 2 angles and a side (not between the angles) or 2 sides and an angle (not between the sides).

Cosine rule: c2 = a2 + b2 − 2ab cosC

Use this rule when you know: 3 sides or 2 sides and the angle between them.

Area of a triangle: Area = ½ ab sinC

Use this rule when you know: 3 sides or 2 sides and the angle between them.

Three-figure bearings

Direction given as an angle of a full circle. North is 000° and the angle is expressed in the clockwise direction from North. So East is 090°, South is 180° and West 270°.

3.3. Circular functions

Circular functions
Circular functions 1

Trigonometric function y = a sin(bx + c) + d

trigonometric function

Trigonometric identities

trigonometric identities