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1. Consider the graph of the function y = sin x + cos x. Describe its overall shape. Is it periodic? How do you know?

1. Consider the graph of the function y = sin x + cos x. Describe its overall shape.

  • Is it periodic?
  • How do you know?

2. Using a graphing calculator or other graphing device, estimate the x- and y-values of the maximum point for the graph (the first such point where x > 0). It may be helpful to express the x-value as a multiple of .

3. Now consider other graphs of the form y = A sin x + B cos x for various values of A and B.

  • Sketch the graph when A = 2 and B = 1, and, find the x - and y-values for the maximum point. (Remember to express the x-value as a multiple of , if possible.)
  • Has it moved?

4. Repeat and sketch the graph for A = 1, B = 2.

  • Is there any relationship to what you found in part (2)?

5. Explain what you have discovered from completing this activity using details and examples.

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