Derivatives of trigonometric functions Class activity Play

Detecting outliers Student activity Play

Determining the sign of the tangent Whiteboard exercise Play

Determining the signs of trigonometric functions Student activity Play

Distance – a more difficult problem Student activity Play

Distance – a more difficult problem Whiteboard exercise Play

Dividing natural numbers Student activity Play

Divisibility by 11 Student activity Play

Division algorithm Student activity Play

Domain and periodicity of trigonometric functions Student activity Play

Double-angle formula for the tangent Student activity Play

Double-angle formula for the tangent Whiteboard exercise Play

Double-angle formulas Class activity Play

Double-angle formulas Whiteboard presentation Play

Drawing the tangent Animation Play

Effectiveness Whiteboard exercise Play

Equal angles imply parallel lines Student activity Play

Equal segments Animation Play

Equality of tangent and cotangent Whiteboard exercise Play

Equations and tables Student activity Play

Equations involving the tangent function Whiteboard exercise Play

Equations involving the tangent function Student activity Play

Equations with tan(ax) Whiteboard exercise Play

Equations with  tan(ax) Student activity Play

Estimating the gradient Student activity Play