Precalculus Examples

$V (t) = 229 \sin (120 π t)$

Step 1

Use the form $a \sin (b t - c) + d$ to find the variables used to find the amplitude, period, phase shift, and vertical shift.

$a = 229$

$b = 120 π$

$c = 0$

$d = 0$

Step 2

Find the amplitude $| a |$ .

Amplitude: $229$

Step 3

Find the period of $229 \sin (120 π t)$ .

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Step 3.1

The period of the function can be calculated using $\frac{2 π}{| b |}$ .

$\frac{2 π}{| b |}$

Step 3.2

Replace $b$ with $120 π$ in the formula for period.

$\frac{2 π}{| 120 π |}$

Step 3.3

$120 π$ is approximately $376.99111843$ which is positive so remove the absolute value

$\frac{2 π}{120 π}$

Step 3.4

Cancel the common factor of $2$ and $120$ .

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Step 3.4.1

Factor $2$ out of $2 π$ .

$\frac{2 (π)}{120 π}$

Step 3.4.2

Cancel the common factors.

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Step 3.4.2.1

Factor $2$ out of $120 π$ .

$\frac{2 (π)}{2 (60 π)}$

Step 3.4.2.2

Cancel the common factor.

$\frac{2 π}{2 (60 π)}$

Step 3.4.2.3

Rewrite the expression.

$\frac{π}{60 π}$

Step 3.5

Cancel the common factor of $π$ .

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Step 3.5.1

Cancel the common factor.

$\frac{π}{60 π}$

Step 3.5.2

Rewrite the expression.

$\frac{1}{60}$

Step 4

Find the phase shift using the formula $\frac{c}{b}$ .

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Step 4.1

The phase shift of the function can be calculated from $\frac{c}{b}$ .

Phase Shift: $\frac{c}{b}$

Step 4.2

Replace the values of $c$ and $b$ in the equation for phase shift.

Phase Shift: $\frac{0}{120 π}$

Step 4.3

Cancel the common factor of $0$ and $120$ .

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Step 4.3.1

Factor $120$ out of $0$ .

Phase Shift: $\frac{120 (0)}{120 π}$

Step 4.3.2

Cancel the common factors.

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Step 4.3.2.1

Factor $120$ out of $120 π$ .

Phase Shift: $\frac{120 (0)}{120 (π)}$

Step 4.3.2.2

Cancel the common factor.

Phase Shift: $\frac{120 \cdot 0}{120 π}$

Step 4.3.2.3

Rewrite the expression.

Phase Shift: $\frac{0}{π}$

Step 4.4

Divide $0$ by $π$ .

Phase Shift: $0$

Step 5

List the properties of the trigonometric function.

Amplitude: $229$

Period: $\frac{1}{60}$

Phase Shift: None

Vertical Shift: None

Step 6