The signs of trigonometric functions Whiteboard exercise Play

The signs of trigonometric functions – clockwise turn Whiteboard exercise Play

The simpler way to write algebraic expressions Whiteboard exercise Play

The sine – reducing angles Student activity Play

The sine – reducing angles Whiteboard exercise Play

The steep road Animation Play

The steepest part of a road Animation Play

The test-point method – activities Whiteboard exercise Play

Thermometer Whiteboard exercise Play

Trigonometric functions and their signs Animation Play

When a function changes sign Student activity Play

Why are negative numbers necessary? Student activity Play

Writing in the form of algebraic expression Whiteboard exercise Play

Zeros of a function Whiteboard presentation Play

Zeros of a function Class activity Play

 When a function changes sign Whiteboard exercise Play

 When a function does not change its sign Animation Play