Math Problem Statement

(c) Plot the graph of y = 0.5 sin 2x for 0 ≤ x ≤ 360. Use the graph to find the amplitude and the period of the graph. (6 marks)

Solution

To analyze the function y=0.5sin(2x)y = 0.5 \sin(2x) over the interval 0x3600 \leq x \leq 360, let's break down the steps to plot the graph and determine its amplitude and period.

Step 1: Identify Key Characteristics

  1. Amplitude: The amplitude of a sine function y=Asin(Bx)y = A \sin(Bx) is given by the absolute value of AA. Here, A=0.5A = 0.5, so the amplitude is: Amplitude=0.5=0.5\text{Amplitude} = |0.5| = 0.5

  2. Period: The period of a sine function is calculated using the formula: Period=360B\text{Period} = \frac{360^\circ}{B} where B=2B = 2 in this case. Thus, the period is: Period=3602=180\text{Period} = \frac{360^\circ}{2} = 180^\circ

Step 2: Plot the Graph

  1. Create a Table of Values: Calculate values of yy at key points in the interval.

    xx (degrees)y=0.5sin(2x)y = 0.5 \sin(2x)
    00
    300.5
    600.866
    901
    1200.866
    1500.5
    1800
    210-0.5
    240-0.866
    270-1
    300-0.866
    330-0.5
    3600
  2. Plot Points: Using these calculated values, plot the points on a coordinate system and connect them to form the sine wave.

Step 3: Graphing Tool

To visualize, you can use graphing software or a graphing calculator to plot these points. The graph will oscillate between 0.5 and -0.5 with a repeating pattern every 180 degrees.

Step 4: Conclusion

From the graph, you can confirm:

  • Amplitude: 0.5
  • Period: 180 degrees

If you need the graph plotted or further clarification, let me know!

Additional Questions

  1. How do you derive the sine function's properties from its equation?
  2. What are other trigonometric functions and their characteristics?
  3. How can you apply this knowledge to solve real-world problems?
  4. What happens to the amplitude if the coefficient in front of the sine function changes?
  5. How would the graph change if the function were y=0.5sin(2x)y = -0.5 \sin(2x)?

Tip: When analyzing periodic functions, always note their amplitude and period as they significantly impact their shape and behavior.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Sine Functions
Graphing

Formulas

Amplitude = |A| for y = A sin(Bx)
Period = 360° / B

Theorems

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Suitable Grade Level

Grades 9-12