Find Amplitude, Period, and Phase Shift 90+20sin(160pit)

$90 + 20 \sin (160 π t)$

Step 1

Rewrite the expression as $20 \sin (160 π t) + 90$ .

$20 \sin (160 π t) + 90$

Step 2

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

$a = 20$

$b = 160 π$

$c = 0$

$d = 90$

Step 3

Find the amplitude $| a |$ .

Amplitude: $20$

Step 4

Find the period using the formula $\frac{2 π}{| b |}$ .

Find the period of $20 \sin (160 π t)$ .

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

$\frac{2 π}{| b |}$

Replace $b$ with $160 π$ in the formula for period.

$\frac{2 π}{| 160 π |}$

$160 π$ is approximately $502.65482457$ which is positive so remove the absolute value

$\frac{2 π}{160 π}$

Cancel the common factor of $2$ and $160$ .

Factor $2$ out of $2 π$ .

$\frac{2 (π)}{160 π}$

Cancel the common factors.

Factor $2$ out of $160 π$ .

$\frac{2 (π)}{2 (80 π)}$

Cancel the common factor.

$\frac{2 π}{2 (80 π)}$

Rewrite the expression.

$\frac{π}{80 π}$

Cancel the common factor of $π$ .

Cancel the common factor.

$\frac{π}{80 π}$

Rewrite the expression.

$\frac{1}{80}$

Find the period of $90$ .

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

$\frac{2 π}{| b |}$

Replace $b$ with $160 π$ in the formula for period.

$\frac{2 π}{| 160 π |}$

$160 π$ is approximately $502.65482457$ which is positive so remove the absolute value

$\frac{2 π}{160 π}$

Cancel the common factor of $2$ and $160$ .

Factor $2$ out of $2 π$ .

$\frac{2 (π)}{160 π}$

Cancel the common factors.

Factor $2$ out of $160 π$ .

$\frac{2 (π)}{2 (80 π)}$

Cancel the common factor.

$\frac{2 π}{2 (80 π)}$

Rewrite the expression.

$\frac{π}{80 π}$

Cancel the common factor of $π$ .

Cancel the common factor.

$\frac{π}{80 π}$

Rewrite the expression.

$\frac{1}{80}$

The period of addition/subtraction of trig functions is the maximum of the individual periods.

$\frac{1}{80}$

Step 5

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

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

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

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

Phase Shift: $\frac{0}{160 π}$

Cancel the common factor of $0$ and $160$ .

Factor $160$ out of $0$ .

Phase Shift: $\frac{160 (0)}{160 π}$

Cancel the common factors.

Factor $160$ out of $160 π$ .

Phase Shift: $\frac{160 (0)}{160 (π)}$

Cancel the common factor.

Phase Shift: $\frac{160 \cdot 0}{160 π}$

Rewrite the expression.

Phase Shift: $\frac{0}{π}$

Divide $0$ by $π$ .

Phase Shift: $0$

Step 6

List the properties of the trigonometric function.

Amplitude: $20$

Period: $\frac{1}{80}$

Phase Shift: None

Vertical Shift: $90$

Step 7

Find Amplitude, Period, and Phase Shift 90+20sin(160pit)

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