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Problem 553
553
Describe fully a sequence of three transformations which can be combined to transform the graph of \(y = \sin x\) for \(0 \leq x \leq \frac{1}{2}\pi\) to the graph of \(y = f(x)\), where \(f(x) = 3 + 2 \sin \frac{1}{4}x\), making clear the order in which the transformations are applied.
Solution
To transform the graph of \(y = \sin x\) to \(y = f(x) = 3 + 2 \sin \frac{1}{4}x\), apply the following transformations in order:
Stretch the graph horizontally by a factor of 4 in the x-direction. This changes \(\sin x\) to \(\sin \frac{1}{4}x\).
Stretch the graph vertically by a factor of 2 in the y-direction. This changes \(\sin \frac{1}{4}x\) to \(2 \sin \frac{1}{4}x\).
Translate the graph vertically by 3 units upwards. This changes \(2 \sin \frac{1}{4}x\) to \(3 + 2 \sin \frac{1}{4}x\).