Find Amplitude, Period, and Phase Shift y=-2cot(pi/4x)

$y = - 2 \cot (\frac{π}{4} x)$

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

$a = - 2$

$b = \frac{π}{4}$

$c = 0$

$d = 0$

Since the graph of the function $c o t$ does not have a maximum or minimum value, there can be no value for the amplitude.

Amplitude: None

Find the period of $- 2 \cot (\frac{π x}{4})$ .

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

$\frac{π}{| b |}$

Replace $b$ with $\frac{π}{4}$ in the formula for period.

$\frac{π}{| \frac{π}{4} |}$

$\frac{π}{4}$ is approximately $0.78539816$ which is positive so remove the absolute value

$\frac{π}{\frac{π}{4}}$

Multiply the numerator by the reciprocal of the denominator.

$π \frac{4}{π}$

Cancel the common factor of $π$ .

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Cancel the common factor.

$π \frac{4}{π}$

Rewrite the expression.

$4$

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

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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: $\frac{0}{\frac{π}{4}}$

Multiply the numerator by the reciprocal of the denominator.

Phase Shift: $0 (\frac{4}{π})$

Multiply $0$ by $\frac{4}{π}$ .

Phase Shift: $0$

List the properties of the trigonometric function.

Amplitude: None

Period: $4$

Phase Shift: None

Vertical Shift: None

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