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GCSE Edexcel Trigonometry - Edexcel Trigonometric graphs - Higher The three trigonometric ratios; sine, cosine and tangent are used to calculate angles and lengths in right-angled triangles. The ...
x = 30 ∘ Draw the horizontal line y = 0.5. The line y = 0.5 crosses the graph of y = sin x four times in the interval 360 ∘ ≤ θ ≤ 360 ∘ so there are four solutions.
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