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	[Class activity] Use of a calculator Play

	[Whiteboard presentation] Use of a calculator Play

	[Student activity] Are all trigonometric functions really necessary? Play

	[Student activity] Finding the period Play

	[Student activity] Looking for the formula for a trigonometric function Play

	[Student activity] Trigonometric identities – investigations Play

	[Student activity] Trigonometric ratios in a right-angled triangle Play

	[Student activity] Trigonometric ratios – problems Play

	[Animation] Functions 'similar' to trigonometric functions Play

	[Animation] Sum of trigonometric functions – investigations Play

	[Animation] The height of a tree Play

	[Simulation] Finding representations of trigonometric functions Play

	[Simulation] Finding the period Play

	[Simulation] Looking for the formula for a trigonometric function Play

	[Simulation] Trigonometric identities – investigations Play

	[Whiteboard exercise] Finding the length of a side of a right-angled triangle Play

	[Whiteboard exercise] Finding the measure of an angle of a right-angled triangle Play

	[Whiteboard exercise] Trigonometric ratios in a right-angled triangle Play

	[Whiteboard exercise] Trigonometric ratios – a lighthouse Play

	[Whiteboard exercise] Trigonometric ratios – distance to a star Play

	[Whiteboard exercise] Trigonometric ratios – the altitude of the Sun Play