2.1: Graphs of the Sine and Cosine Functions
https://math.libretexts.org/Courses/Reedley_College/Trigonometry/02%3A_Graphing_the_Trigonometric_Functions/2.01%3A_Graphs_of_the_Sine_and_Cosine_Functions
WebMay 28, 2021 · The graph could represent either a sine or a cosine function that is shifted and/or reflected. When \(x=0\), the graph has an extreme point, \((0,0)\). Since the cosine function has an extreme point for \(x=0\), let us write our equation in terms of a cosine function. Let’s start with the midline.
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