Math Problem Statement

Tentukan amplitudo, periode dan gambarkan grafik fungsi trigonometri untuk y = 2sinx, y = 3sinx, y = 4sinx, y = 6cosx, y = 6cos(x/4), y = 6cos(4x)

Solution

The image you uploaded contains trigonometric functions where you're asked to determine the amplitude, period, and sketch the graph for one period. Let's solve each part:

General form of Trigonometric Functions:

  1. Sine Function: y=Asin(Bx)y = A \sin(Bx)
  2. Cosine Function: y=Acos(Bx)y = A \cos(Bx)
  • Amplitude: A|A| (the coefficient of sine or cosine)
  • Period: 2πB\frac{2\pi}{|B|} (where BB is the coefficient of xx)

Let's analyze each function:

1. y=2sinxy = 2 \sin x

  • Amplitude: 2=2|2| = 2
  • Period: 2π1=2π\frac{2\pi}{1} = 2\pi

2. y=3sinxy = 3 \sin x

  • Amplitude: 3=3|3| = 3
  • Period: 2π1=2π\frac{2\pi}{1} = 2\pi

3. y=4sinxy = 4 \sin x

  • Amplitude: 4=4|4| = 4
  • Period: 2π1=2π\frac{2\pi}{1} = 2\pi

4. y=6cosxy = 6 \cos x

  • Amplitude: 6=6|6| = 6
  • Period: 2π1=2π\frac{2\pi}{1} = 2\pi

5. y=6cos(x4)y = 6 \cos \left( \frac{x}{4} \right)

  • Amplitude: 6=6|6| = 6
  • Period: 2π14=8π\frac{2\pi}{\frac{1}{4}} = 8\pi

6. y=6cos(4x)y = 6 \cos(4x)

  • Amplitude: 6=6|6| = 6
  • Period: 2π4=π2\frac{2\pi}{4} = \frac{\pi}{2}

Would you like details on how to sketch these graphs or how the calculations were made?

Here are 5 related questions to deepen your understanding:

  1. How do you determine the phase shift of a sine or cosine function?
  2. What is the relationship between period and frequency in trigonometric functions?
  3. Can you explain how to determine the vertical shift of a sine function?
  4. What would happen to the graph if the sine or cosine function had a negative amplitude?
  5. How do you sketch multiple periods of a trigonometric function?

Tip: Always check the coefficient of xx to determine the period of a trigonometric function. It controls how "stretched" or "compressed" the graph is along the x-axis.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Sine Function
Cosine Function

Formulas

Amplitude: |A|
Period of sine or cosine function: 2π/|B| for y = A sin(Bx) or y = A cos(Bx)

Theorems

Trigonometric function properties: amplitude and period

Suitable Grade Level

Grades 10-12