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Using a graph of  cos() for reference, graph cos()

How does the absolute value change a value?
How would this change look on a graph?

Repeating curve, moving from high to low points. High points are normal wave vertices, but low points are sharp turns, like connected sides of parabolas. First visible high & low points: (negative pi, comma 1), & (negative pi halves, coma 0), continuing in that pattern just past 3 pi halves.