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Today, 03:59

Choose the graph of y = 2 cos x

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  1. Today, 06:49
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    Y = cos x begins at (0,1), descends to (pi/2,0), descends to (pi,-1), ascends to (3pi/2,0), and then ascends to (2pi, 1). This covers only one full period.

    The graph of y = 2cost x is the same, except that the amplitudes (y-values) are 2x as great as before:

    (0,2), (pi/2, 0), and so on.
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