This is designed to be the third lesson on trigonometric graphs looking at the amplitude and period as well as equivalent values. This comes with an excellent matching activity, as well as questions on the slides, excellent teaching material and examples throughout, lesson objectives, answers, a starter and a plenary. 16 slides.
This lesson does come as a much larger bundle on teaching trigonometry, which I do highly recommend as the lessons do form a sequence and do build on each other.
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