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Find the equation of the upper curve, expressed as a cosine function.
Mathematics 9709 · AS & A Level · Trigonometry
Trigonometry — practice question
In the diagram, the lower curve is given by $y = \cos \theta$. The upper curve is produced by a combination of transformations applied to $y = \cos \theta$.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Obtain $y=|3|+2[\cos(\tfrac{\theta}{2})]$ or an equivalent form” …
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