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Full topic overview
Level 3 trigonometry (AS91575) is about manipulating and solving with trig functions, not just evaluating them. You use the compound and double angle formulae to rewrite expressions and find exact values, solve trigonometric equations over a domain and in general form, and model periodic situations — tides, daylight, temperature — with a sine or cosine function. You also need to choose the right identity, give all solutions, and build and use a model in a real New Zealand context.