Question

How do you write an equation as a sine function with four parameter-
A
B
C
D

Answer 1

To write an equation as a sine function using four parameters, you typically use the general form of a sinusoidal function, which can be expressed as:

\[ y = A \sin(B(x - C)) + D \]

Where the parameters have the following meanings:

- \( A \): Amplitude - This determines the height of the peaks of the sine wave. The amplitude is the absolute value of \( A \).

- \( B \): Frequency - This affects the period of the sine wave. The period \( P \) of the function is given by the formula \( P = \frac{2\pi}{|B|} \). Higher values of \( B \) compress the wave and result in more cycles over the same interval.

- \( C \): Phase Shift - This determines the horizontal shift of the sine wave. If \( C \) is positive, the graph shifts to the right; if \( C \) is negative, it shifts to the left.

- \( D \): Vertical Shift - This shifts the entire graph up or down. A positive \( D \) moves the graph up, while a negative \( D \) moves it down.

### Example

Let’s say you want to create a sine function with:

- Amplitude \( A = 3 \)
- Frequency \( B = 2 \)
- Phase Shift \( C = \frac{\pi}{4} \)
- Vertical Shift \( D = 1 \)

The sine function would be expressed as:

\[ y = 3 \sin\left(2\left(x - \frac{\pi}{4}\right)\right) + 1 \]

This represents a sine wave with an amplitude of 3, a period of \( \frac{\pi}{1} \) (due to \( B = 2 \)), shifted \( \frac{\pi}{4} \) units to the right, and raised 1 unit above the x-axis.

### Adjusting the Parameters

You can adjust the values of \( A \), \( B \), \( C \), and \( D \) based on your needs to create different sinusoidal functions tailored to specific applications or data sets.