IGCSE Maths / Graphs and transformations
Transforming trigonometric graphs revision notes
Edexcel International GCSE Maths (4MA1), chapter 26: Graphs and transformations, specification point 3.3b. Part of the full course.
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Changes to a sine or cosine equation can move the curve up or down, move it sideways, or stretch or squash it. The position of a number in the equation tells you which transformation happens, and a number inside the brackets moves the curve in the opposite direction to its sign.