Reduction formulas for the tangent Animation Play

Relations between the sine and the cosine Whiteboard exercise Play

Shifting the graph along the  x-axis Animation Play

Simple trigonometric equations Whiteboard presentation Play

Simple trigonometric equations Class activity Play

Solving equations involving the cosine function Animation Play

Solving equations with cos(ax) Whiteboard exercise Play

Solving problems involving trigonometric equations Whiteboard presentation Play

Solving problems involving trigonometric equations Class activity Play

Solving problems involving trigonometric ratios Whiteboard presentation Play

Solving problems involving trigonometric ratios Class activity Play

Solving systems of inequalities Student activity Play

Solving systems of inequalities Whiteboard exercise Play

Solving trigonometric equations involving the cosine function Whiteboard exercise Play

Solving trigonometric equations using the tangent function Whiteboard exercise Play

Stretching the graph along the y-axis. Symmetry with respect to the x-axis Student activity Play

Substituting – a complex problem Student activity Play

Sum and difference identities for the cosine Student activity Play

Sum and difference identities for the cosine Whiteboard exercise Play

Sum identity for the cosine Animation Play

The anti-derivative of the cosine function Whiteboard exercise Play

The cosine and coordinates of the points Animation Play

The cosine of an arbitrary angle Student activity Play

The cosine of an arbitrary angle Simulation Play

The cosine rule Whiteboard presentation Play